fix: 修正 conversion 代理路径和错误边界

backend/internal/conversion/anthropic/adapter_test.go

@@ -49,6 +49,28 @@ func TestAdapter_DetectInterfaceType(t *testing.T) {
 	}
 }
 
+func TestAdapter_APIReferenceNativePaths(t *testing.T) {
+	a := NewAdapter()
+
+	// docs/api_reference/anthropic defines messages and models under /v1.
+	tests := []struct {
+		path     string
+		expected conversion.InterfaceType
+	}{
+		{"/v1/messages", conversion.InterfaceTypeChat},
+		{"/v1/models", conversion.InterfaceTypeModels},
+		{"/v1/models/claude-sonnet-4-5", conversion.InterfaceTypeModelInfo},
+		{"/messages", conversion.InterfaceTypePassthrough},
+		{"/models", conversion.InterfaceTypePassthrough},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.path, func(t *testing.T) {
+			assert.Equal(t, tt.expected, a.DetectInterfaceType(tt.path))
+		})
+	}
+}
+
 func TestAdapter_BuildUrl(t *testing.T) {
 	a := NewAdapter()