fix(gemini): preserve displayName and description in models list

Previously GeminiModels handler unconditionally overwrote displayName
and description with the model name, losing the original values defined
in model definitions (e.g., 'Gemini 3 Pro Preview').

Now only set these fields as fallback when they are missing or empty.

internal/runtime/executor/antigravity_executor.go

@@ -994,7 +994,7 @@ func FetchAntigravityModels(ctx context.Context, auth *cliproxyauth.Auth, cfg *c
 		now := time.Now().Unix()
 		modelConfig := registry.GetAntigravityModelConfig()
 		models := make([]*registry.ModelInfo, 0, len(result.Map()))
-		for originalName := range result.Map() {
+		for originalName, modelData := range result.Map() {
 			modelID := strings.TrimSpace(originalName)
 			if modelID == "" {
 				continue
@@ -1004,12 +1004,18 @@ func FetchAntigravityModels(ctx context.Context, auth *cliproxyauth.Auth, cfg *c
 				continue
 			}
 			modelCfg := modelConfig[modelID]
-			modelName := modelID
+
+			// Extract displayName from upstream response, fallback to modelID
+			displayName := modelData.Get("displayName").String()
+			if displayName == "" {
+				displayName = modelID
+			}
+
 			modelInfo := &registry.ModelInfo{
 				ID:          modelID,
-				Name:        modelName,
+				Name:        modelID,
-				Description: modelID,
+				Description: displayName,
-				DisplayName: modelID,
+				DisplayName: displayName,
 				Version:     modelID,
 				Object:      "model",
 				Created:     now,

sdk/api/handlers/gemini/gemini_handlers.go

@@ -60,8 +60,12 @@ func (h *GeminiAPIHandler) GeminiModels(c *gin.Context) {
 			if !strings.HasPrefix(name, "models/") {
 				normalizedModel["name"] = "models/" + name
 			}
-			normalizedModel["displayName"] = name
+			if displayName, _ := normalizedModel["displayName"].(string); displayName == "" {
-			normalizedModel["description"] = name
+				normalizedModel["displayName"] = name
+			}
+			if description, _ := normalizedModel["description"].(string); description == "" {
+				normalizedModel["description"] = name
+			}
 		}
 		if _, ok := normalizedModel["supportedGenerationMethods"]; !ok {
 			normalizedModel["supportedGenerationMethods"] = defaultMethods