fix(logging): track Codex backend request IDs

internal/logging/gin_logger.go

@@ -26,6 +26,7 @@ var aiAPIPrefixes = []string{
 	"/v1/responses",
 	"/v1beta/models/",
 	"/api/provider/",
+	"/backend-api/codex",
 }
 
 const (

internal/logging/gin_logger_test.go

@@ -73,3 +73,44 @@ func TestIsAIAPIPathIncludesImages(t *testing.T) {
 		t.Fatalf("expected /v1/videos/video_123 to be treated as AI API path")
 	}
 }
+
+func TestIsAIAPIPathIncludesCodexBackend(t *testing.T) {
+	paths := []string{
+		"/backend-api/codex/responses",
+		"/backend-api/codex/responses/compact",
+	}
+	for _, path := range paths {
+		if !isAIAPIPath(path) {
+			t.Fatalf("expected %s to be treated as AI API path", path)
+		}
+	}
+}
+
+func TestGinLogrusLoggerAddsRequestIDForCodexBackend(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	engine := gin.New()
+	engine.Use(GinLogrusLogger())
+
+	var requestIDFromContext string
+	var requestIDFromGin string
+	engine.POST("/backend-api/codex/responses", func(c *gin.Context) {
+		requestIDFromContext = GetRequestID(c.Request.Context())
+		requestIDFromGin = GetGinRequestID(c)
+		c.Status(http.StatusOK)
+	})
+
+	req := httptest.NewRequest(http.MethodPost, "/backend-api/codex/responses", nil)
+	recorder := httptest.NewRecorder()
+	engine.ServeHTTP(recorder, req)
+
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", recorder.Code)
+	}
+	if requestIDFromContext == "" {
+		t.Fatalf("expected request ID in request context")
+	}
+	if requestIDFromGin != requestIDFromContext {
+		t.Fatalf("expected Gin request ID %q to match context request ID %q", requestIDFromGin, requestIDFromContext)
+	}
+}