refactor: 后端日志系统重构

- 新增模块化日志器（pkg/logger/module.go）
- 新增 GORM 日志适配器
- 统一日志入口，移除所有 zap.L() 全局 logger 调用
- 字段标准化
- 启动阶段使用结构化日志
- 更新所有相关测试

backend/internal/conversion/engine.go

@@ -7,6 +7,8 @@ import (
 
 	"github.com/google/uuid"
 	"go.uber.org/zap"
+
+	pkglogger "nex/backend/pkg/logger"
 )
 
 // HTTPRequestSpec HTTP 请求规格
@@ -33,13 +35,10 @@ type ConversionEngine struct {
 
 // NewConversionEngine 创建转换引擎
 func NewConversionEngine(registry AdapterRegistry, logger *zap.Logger) *ConversionEngine {
-	if logger == nil {
-		logger = zap.L()
-	}
 	return &ConversionEngine{
 		registry:        registry,
 		middlewareChain: NewMiddlewareChain(),
-		logger:          logger,
+		logger:          pkglogger.WithModule(logger, "conversion.engine"),
 	}
 }
 
@@ -90,7 +89,7 @@ func (e *ConversionEngine) ConvertHttpRequest(spec HTTPRequestSpec, clientProtoc
 				rewrittenBody, err = providerAdapter.RewriteRequestModelName(spec.Body, provider.ModelName, interfaceType)
 				if err != nil {
 					e.logger.Warn("Smart Passthrough 改写请求失败，使用原始请求体",
-						zap.String("error", err.Error()),
+						zap.Error(err),
 						zap.String("interface", string(interfaceType)))
 					rewrittenBody = spec.Body
 				}
@@ -142,9 +141,9 @@ func (e *ConversionEngine) ConvertHttpResponse(spec HTTPResponseSpec, clientProt
 
 			rewrittenBody, err := adapter.RewriteResponseModelName(spec.Body, modelOverride, interfaceType)
 			if err != nil {
-				e.logger.Warn("Smart Passthrough 改写响应失败，使用原始响应体",
-					zap.String("error", err.Error()),
-					zap.String("interface", string(interfaceType)))
+					e.logger.Warn("Smart Passthrough 改写响应失败，使用原始响应体",
+						zap.Error(err),
+						zap.String("interface", string(interfaceType)))
 				return &spec, nil
 			}
 
@@ -312,7 +311,7 @@ func (e *ConversionEngine) convertModelsResponseBody(clientAdapter, providerAdap
 	}
 	encoded, err := clientAdapter.EncodeModelsResponse(models)
 	if err != nil {
-		e.logger.Warn("编码 Models 响应失败，返回原始响应", zap.String("error", err.Error()))
+		e.logger.Warn("编码 Models 响应失败，返回原始响应", zap.Error(err))
 		return body, nil
 	}
 	return encoded, nil

backend/internal/conversion/engine_supplemental_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
 )
 
 func TestConversionError_WithProviderProtocol(t *testing.T) {
@@ -39,7 +40,7 @@ func TestConversionError_FullBuilder(t *testing.T) {
 
 func TestEngine_Use(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	called := false
 	engine.Use(&testMiddleware{fn: func(req *canonical.CanonicalRequest, cp, pp string, ctx *ConversionContext) (*canonical.CanonicalRequest, error) {
 		called = true
@@ -66,7 +67,7 @@ func TestEngine_Use(t *testing.T) {
 
 func TestConvertHttpRequest_DecodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.decodeReqFn = func(raw []byte) (*canonical.CanonicalRequest, error) {
 		return nil, errors.New("decode failed")
@@ -82,7 +83,7 @@ func TestConvertHttpRequest_DecodeError(t *testing.T) {
 
 func TestConvertHttpRequest_EncodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("client", false))
 	providerAdapter := newMockAdapter("provider", false)
 	providerAdapter.encodeReqFn = func(req *canonical.CanonicalRequest, p *TargetProvider) ([]byte, error) {
@@ -98,7 +99,7 @@ func TestConvertHttpRequest_EncodeError(t *testing.T) {
 
 func TestConvertHttpResponse_CrossProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.encodeRespFn = func(resp *canonical.CanonicalResponse) ([]byte, error) {
@@ -121,7 +122,7 @@ func TestConvertHttpResponse_CrossProtocol(t *testing.T) {
 
 func TestConvertHttpResponse_DecodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	providerAdapter := newMockAdapter("provider", false)
 	providerAdapter.decodeRespFn = func(raw []byte) (*canonical.CanonicalResponse, error) {
 		return nil, errors.New("decode error")
@@ -135,7 +136,7 @@ func TestConvertHttpResponse_DecodeError(t *testing.T) {
 
 func TestConvertHttpRequest_EmbeddingInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.ifaceType = InterfaceTypeEmbeddings
@@ -158,7 +159,7 @@ func TestConvertHttpRequest_EmbeddingInterface(t *testing.T) {
 
 func TestConvertHttpRequest_RerankInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.ifaceType = InterfaceTypeRerank
@@ -178,7 +179,7 @@ func TestConvertHttpRequest_RerankInterface(t *testing.T) {
 
 func TestConvertHttpResponse_EmbeddingInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.supportsIface = map[InterfaceType]bool{InterfaceTypeEmbeddings: true}
@@ -196,7 +197,7 @@ func TestConvertHttpResponse_EmbeddingInterface(t *testing.T) {
 
 func TestConvertHttpResponse_RerankInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.supportsIface = map[InterfaceType]bool{InterfaceTypeRerank: true}
@@ -214,7 +215,7 @@ func TestConvertHttpResponse_RerankInterface(t *testing.T) {
 
 func TestConvertHttpRequest_ModelsInterface_Passthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.ifaceType = InterfaceTypeModels
 	providerAdapter := newMockAdapter("provider", false)
@@ -232,7 +233,7 @@ func TestConvertHttpRequest_ModelsInterface_Passthrough(t *testing.T) {
 
 func TestConvertHttpResponse_ModelsInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.supportsIface = map[InterfaceType]bool{InterfaceTypeModels: true}
 	providerAdapter := newMockAdapter("provider", false)
@@ -249,7 +250,7 @@ func TestConvertHttpResponse_ModelsInterface(t *testing.T) {
 
 func TestConvertHttpResponse_ModelInfoInterface(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.supportsIface = map[InterfaceType]bool{InterfaceTypeModelInfo: true}
 	providerAdapter := newMockAdapter("provider", false)
@@ -324,7 +325,7 @@ var _ = json.Marshal
 
 func TestConvertEmbeddingBody_DecodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.decodeEmbeddingReqFn = func(raw []byte) (*canonical.CanonicalEmbeddingRequest, error) {
@@ -344,7 +345,7 @@ func TestConvertEmbeddingBody_DecodeError(t *testing.T) {
 
 func TestConvertRerankBody_DecodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.decodeRerankReqFn = func(raw []byte) (*canonical.CanonicalRerankRequest, error) {
@@ -364,7 +365,7 @@ func TestConvertRerankBody_DecodeError(t *testing.T) {
 
 func TestConvertBody_UnknownInterfaceType(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	providerAdapter := newMockAdapter("provider", false)

backend/internal/conversion/engine_test.go

@@ -203,7 +203,7 @@ func (e *noopStreamEncoder) Flush() [][]byte
 
 func TestNewConversionEngine(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	assert.NotNil(t, engine)
 	assert.Equal(t, registry, engine.GetRegistry())
 }
@@ -211,7 +211,7 @@ func TestNewConversionEngine(t *testing.T) {
 func TestNewConversionEngine_LoggerInjection(t *testing.T) {
 	t.Run("nil_logger_uses_global", func(t *testing.T) {
 		registry := NewMemoryRegistry()
-		engine := NewConversionEngine(registry, nil)
+		engine := NewConversionEngine(registry, zap.NewNop())
 		assert.NotNil(t, engine.logger)
 	})
 
@@ -219,13 +219,14 @@ func TestNewConversionEngine_LoggerInjection(t *testing.T) {
 		registry := NewMemoryRegistry()
 		customLogger := zap.NewNop()
 		engine := NewConversionEngine(registry, customLogger)
-		assert.Equal(t, customLogger, engine.logger)
+		assert.NotNil(t, engine.logger)
+		assert.Contains(t, engine.logger.Name(), "conversion.engine")
 	})
 }
 
 func TestRegisterAdapter(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	adapter := newMockAdapter("test-proto", true)
 	err := engine.RegisterAdapter(adapter)
@@ -237,7 +238,7 @@ func TestRegisterAdapter(t *testing.T) {
 
 func TestIsPassthrough_SameProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	adapter := newMockAdapter("openai", true)
 	_ = engine.RegisterAdapter(adapter)
 
@@ -246,7 +247,7 @@ func TestIsPassthrough_SameProtocol(t *testing.T) {
 
 func TestIsPassthrough_DifferentProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("openai", true))
 	_ = engine.RegisterAdapter(newMockAdapter("anthropic", true))
 
@@ -255,7 +256,7 @@ func TestIsPassthrough_DifferentProtocol(t *testing.T) {
 
 func TestIsPassthrough_NoPassthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("custom", false))
 
 	assert.False(t, engine.IsPassthrough("custom", "custom"))
@@ -263,7 +264,7 @@ func TestIsPassthrough_NoPassthrough(t *testing.T) {
 
 func TestDetectInterfaceType(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	adapter := newMockAdapter("test", true)
 	adapter.ifaceType = InterfaceTypeChat
 	_ = engine.RegisterAdapter(adapter)
@@ -275,7 +276,7 @@ func TestDetectInterfaceType(t *testing.T) {
 
 func TestDetectInterfaceType_NonExistentProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	_, err := engine.DetectInterfaceType("/v1/chat", "nonexistent")
 	assert.Error(t, err)
@@ -283,7 +284,7 @@ func TestDetectInterfaceType_NonExistentProtocol(t *testing.T) {
 
 func TestConvertHttpRequest_Passthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("openai", true))
 
 	provider := NewTargetProvider("https://api.openai.com/v1", "sk-test", "gpt-4")
@@ -301,7 +302,7 @@ func TestConvertHttpRequest_Passthrough(t *testing.T) {
 
 func TestConvertHttpRequest_CrossProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client-proto", false)
 	clientAdapter.decodeReqFn = func(raw []byte) (*canonical.CanonicalRequest, error) {
@@ -333,7 +334,7 @@ func TestConvertHttpRequest_CrossProtocol(t *testing.T) {
 
 func TestConvertHttpResponse_Passthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("openai", true))
 
 	spec := HTTPResponseSpec{
@@ -349,7 +350,7 @@ func TestConvertHttpResponse_Passthrough(t *testing.T) {
 
 func TestCreateStreamConverter_Passthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("openai", true))
 
 	converter, err := engine.CreateStreamConverter("openai", "openai", "", InterfaceTypeChat)
@@ -360,7 +361,7 @@ func TestCreateStreamConverter_Passthrough(t *testing.T) {
 
 func TestCreateStreamConverter_Canonical(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("client", false))
 	_ = engine.RegisterAdapter(newMockAdapter("provider", false))
 
@@ -372,7 +373,7 @@ func TestCreateStreamConverter_Canonical(t *testing.T) {
 
 func TestEncodeError(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 	_ = engine.RegisterAdapter(newMockAdapter("openai", true))
 
 	convErr := NewConversionError(ErrorCodeInvalidInput, "测试错误")
@@ -384,7 +385,7 @@ func TestEncodeError(t *testing.T) {
 
 func TestEncodeError_NonExistentProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	convErr := NewConversionError(ErrorCodeInvalidInput, "测试错误")
 	body, statusCode, err := engine.EncodeError(convErr, "nonexistent")
@@ -417,7 +418,7 @@ func TestRegistry_GetNonExistent(t *testing.T) {
 
 func TestConvertHttpResponse_ModelOverride_CrossProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	clientAdapter := newMockAdapter("client", false)
 	clientAdapter.encodeRespFn = func(resp *canonical.CanonicalResponse) ([]byte, error) {
@@ -446,7 +447,7 @@ func TestConvertHttpResponse_ModelOverride_CrossProtocol(t *testing.T) {
 
 func TestConvertHttpResponse_ModelOverride_SameProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	// 使用真实 OpenAI adapter 验证 Smart Passthrough 改写
 	openaiAdapter := newMockAdapter("openai", true)
@@ -476,7 +477,7 @@ func TestConvertHttpResponse_ModelOverride_SameProtocol(t *testing.T) {
 
 func TestCreateStreamConverter_ModelOverride_SmartPassthrough(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	openaiAdapter := newMockAdapter("openai", true)
 	openaiAdapter.rewriteRespFn = func(body []byte, newModel string, ifaceType InterfaceType) ([]byte, error) {
@@ -506,7 +507,7 @@ func TestCreateStreamConverter_ModelOverride_SmartPassthrough(t *testing.T) {
 
 func TestCreateStreamConverter_ModelOverride_CrossProtocol(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	// provider adapter 解码出含 model 的流式事件
 	providerAdapter := newMockAdapter("provider", false)
@@ -560,7 +561,7 @@ func TestCreateStreamConverter_ModelOverride_CrossProtocol(t *testing.T) {
 
 func TestCreateStreamConverter_ModelOverride_CrossProtocol_Empty(t *testing.T) {
 	registry := NewMemoryRegistry()
-	engine := NewConversionEngine(registry, nil)
+	engine := NewConversionEngine(registry, zap.NewNop())
 
 	providerAdapter := newMockAdapter("provider", false)
 	providerAdapter.streamDecoderFn = func() StreamDecoder {