feat: support disabling image generation globally

- Added `disable-image-generation` configuration flag to disable the `image_generation` tool globally.
- Updated payload handling to remove `image_generation` tools from request payload arrays when the flag is enabled.
- Modified OpenAI image handlers (`ImagesGenerations`, `ImagesEdits`) to return 404 when the feature is disabled.
- Enhanced configuration diff logging to track changes for the `disable-image-generation` flag.
- Added accompanying unit tests for the new feature in payload helpers and image handler logic.

sdk/api/handlers/openai/openai_images_handlers.go

@@ -198,6 +198,11 @@ func parseBoolField(raw string, fallback bool) bool {
 }
 
 func (h *OpenAIAPIHandler) ImagesGenerations(c *gin.Context) {
+	if h != nil && h.BaseAPIHandler != nil && h.BaseAPIHandler.Cfg != nil && h.BaseAPIHandler.Cfg.DisableImageGeneration {
+		c.AbortWithStatus(http.StatusNotFound)
+		return
+	}
+
 	rawJSON, err := c.GetRawData()
 	if err != nil {
 		c.JSON(http.StatusBadRequest, handlers.ErrorResponse{
@@ -281,6 +286,11 @@ func (h *OpenAIAPIHandler) ImagesGenerations(c *gin.Context) {
 }
 
 func (h *OpenAIAPIHandler) ImagesEdits(c *gin.Context) {
+	if h != nil && h.BaseAPIHandler != nil && h.BaseAPIHandler.Cfg != nil && h.BaseAPIHandler.Cfg.DisableImageGeneration {
+		c.AbortWithStatus(http.StatusNotFound)
+		return
+	}
+
 	contentType := strings.ToLower(strings.TrimSpace(c.GetHeader("Content-Type")))
 	if strings.HasPrefix(contentType, "application/json") {
 		h.imagesEditsFromJSON(c)

sdk/api/handlers/openai/openai_images_handlers_test.go

@@ -10,6 +10,8 @@ import (
 	"testing"
 
 	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/sdk/api/handlers"
+	sdkconfig "github.com/router-for-me/CLIProxyAPI/v6/sdk/config"
 	"github.com/tidwall/gjson"
 )
 
@@ -93,3 +95,27 @@ func TestImagesEditsMultipartRejectsUnsupportedModel(t *testing.T) {
 
 	assertUnsupportedImagesModelResponse(t, resp, "gpt-5.4-mini")
 }
+
+func TestImagesGenerations_DisableImageGeneration_Returns404(t *testing.T) {
+	base := handlers.NewBaseAPIHandlers(&sdkconfig.SDKConfig{DisableImageGeneration: true}, nil)
+	handler := NewOpenAIAPIHandler(base)
+	body := strings.NewReader(`{"prompt":"draw a square"}`)
+
+	resp := performImagesEndpointRequest(t, imagesGenerationsPath, "application/json", body, handler.ImagesGenerations)
+
+	if resp.Code != http.StatusNotFound {
+		t.Fatalf("status = %d, want %d: %s", resp.Code, http.StatusNotFound, resp.Body.String())
+	}
+}
+
+func TestImagesEdits_DisableImageGeneration_Returns404(t *testing.T) {
+	base := handlers.NewBaseAPIHandlers(&sdkconfig.SDKConfig{DisableImageGeneration: true}, nil)
+	handler := NewOpenAIAPIHandler(base)
+	body := strings.NewReader(`{"prompt":"edit this","images":[{"image_url":"data:image/png;base64,AA=="}]}`)
+
+	resp := performImagesEndpointRequest(t, imagesEditsPath, "application/json", body, handler.ImagesEdits)
+
+	if resp.Code != http.StatusNotFound {
+		t.Fatalf("status = %d, want %d: %s", resp.Code, http.StatusNotFound, resp.Body.String())
+	}
+}