feat: 配置 golangci-lint 静态分析并修复存量违规

- 新增 backend/.golangci.yml 配置 12 个 linter（forbidigo、errorlint、errcheck、staticcheck、revive、gocritic、gosec、bodyclose、noctx、nilerr、goimports、gocyclo）
- 新增 lefthook.yml 配置 pre-commit hook 自动运行 lint
- 修复存量代码违规：errors.Is/As 替换、zap.Error 替换、import 排序、errcheck 修复
- 更新 README 补充编码规范说明
- 归档 backend-code-lint 变更

backend/internal/service/service_test.go

@@ -5,6 +5,9 @@ import (
 	"testing"
 	"time"
 
+	"nex/backend/internal/domain"
+	"nex/backend/internal/repository"
+
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -13,8 +16,6 @@ import (
 
 	testHelpers "nex/backend/tests"
 
-	"nex/backend/internal/domain"
-	"nex/backend/internal/repository"
 	appErrors "nex/backend/pkg/errors"
 )
 
@@ -134,7 +135,7 @@ func TestModelService_Create_ProviderNotFound(t *testing.T) {
 	db := setupServiceTestDB(t)
 	providerRepo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewModelService(modelRepo, providerRepo, cache)
 
 	model := &domain.Model{ProviderID: "nonexistent", ModelName: "gpt-4"}
@@ -148,7 +149,7 @@ func TestProviderService_Create_InvalidID(t *testing.T) {
 	db := setupServiceTestDB(t)
 	repo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewProviderService(repo, modelRepo, cache)
 
 	provider := &domain.Provider{ID: "open-ai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}
@@ -160,7 +161,7 @@ func TestProviderService_Create_ValidID(t *testing.T) {
 	db := setupServiceTestDB(t)
 	repo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewProviderService(repo, modelRepo, cache)
 
 	provider := &domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}
@@ -176,7 +177,7 @@ func TestModelService_Update_DuplicateModelName(t *testing.T) {
 	db := setupServiceTestDB(t)
 	providerRepo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewModelService(modelRepo, providerRepo, cache)
 
 	require.NoError(t, providerRepo.Create(&domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}))
@@ -202,7 +203,7 @@ func TestModelService_Update_ModelNotFound(t *testing.T) {
 	db := setupServiceTestDB(t)
 	providerRepo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewModelService(modelRepo, providerRepo, cache)
 
 	err := svc.Update("nonexistent-id", map[string]interface{}{
@@ -215,7 +216,7 @@ func TestModelService_Update_Success(t *testing.T) {
 	db := setupServiceTestDB(t)
 	providerRepo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewModelService(modelRepo, providerRepo, cache)
 
 	require.NoError(t, providerRepo.Create(&domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}))
@@ -241,7 +242,7 @@ func TestProviderService_Update_ImmutableID(t *testing.T) {
 	db := setupServiceTestDB(t)
 	repo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewProviderService(repo, modelRepo, cache)
 
 	provider := &domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}
@@ -259,7 +260,7 @@ func TestProviderService_Update_Success(t *testing.T) {
 	db := setupServiceTestDB(t)
 	repo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewProviderService(repo, modelRepo, cache)
 
 	provider := &domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}
@@ -318,7 +319,8 @@ func TestStatsService_Aggregate_ByModel(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			db := setupServiceTestDB(t)
 			statsRepo := repository.NewStatsRepository(db)
-			buffer := NewStatsBuffer(statsRepo, zap.NewNop()); svc := NewStatsService(statsRepo, buffer)
+			buffer := NewStatsBuffer(statsRepo, zap.NewNop())
+			svc := NewStatsService(statsRepo, buffer)
 
 			result := svc.Aggregate(tt.stats, "model")
 
@@ -379,7 +381,8 @@ func TestStatsService_Aggregate_ByDate(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			db := setupServiceTestDB(t)
 			statsRepo := repository.NewStatsRepository(db)
-			buffer := NewStatsBuffer(statsRepo, zap.NewNop()); svc := NewStatsService(statsRepo, buffer)
+			buffer := NewStatsBuffer(statsRepo, zap.NewNop())
+			svc := NewStatsService(statsRepo, buffer)
 
 			result := svc.Aggregate(tt.stats, "date")
 
@@ -448,7 +451,7 @@ func TestProviderService_List_APIKeyNotMasked(t *testing.T) {
 	db := setupServiceTestDB(t)
 	repo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewProviderService(repo, modelRepo, cache)
 
 	provider1 := &domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "sk-1234567890", BaseURL: "https://api.openai.com"}
@@ -474,7 +477,7 @@ func TestModelService_ConcurrentCreate(t *testing.T) {
 	db := setupServiceTestDB(t)
 	providerRepo := repository.NewProviderRepository(db)
 	modelRepo := repository.NewModelRepository(db)
-	 cache := setupRoutingCache(t, db)
+	cache := setupRoutingCache(t, db)
 	svc := NewModelService(modelRepo, providerRepo, cache)
 
 	require.NoError(t, providerRepo.Create(&domain.Provider{ID: "openai", Name: "OpenAI", APIKey: "key", BaseURL: "https://api.openai.com"}))