将 filtered_models 从硬编码改为可配置参数

1. 在 config.py 中添加 FILTERED_MODELS 配置项
2. 在 .env.example 中添加 FILTERED_MODELS 示例
3. 修改 model_service.py 以使用配置的过滤模型列表
4. 优化模型过滤逻辑

app/services/model_service.py

@@ -11,7 +11,7 @@ class ModelService:
         self.model_search = model_search
         self.model_image = model_image
         self.base_url = "https://generativelanguage.googleapis.com/v1beta"
-        self.filtered_models = ["gemini-1.0-pro-vision-latest", "gemini-pro-vision"]
+        self.filtered_models = settings.FILTERED_MODELS
 
     def get_gemini_models(self, api_key: str) -> Optional[Dict[str, Any]]:
         url = f"{self.base_url}/models?key={api_key}"
@@ -20,6 +20,16 @@ class ModelService:
             response = requests.get(url)
             if response.status_code == 200:
                 gemini_models = response.json()
+                
+                filtered_models_list = []
+                for model in gemini_models.get("models", []):
+                    model_id = model["name"].split("/")[-1]
+                    if model_id not in self.filtered_models:
+                        filtered_models_list.append(model)
+                    else:
+                        logger.info(f"Filtered out model: {model_id}")
+                
+                gemini_models["models"] = filtered_models_list
                 return gemini_models
             else:
                 logger.error(f"Error: {response.status_code}")
@@ -44,11 +54,6 @@ class ModelService:
 
         for model in gemini_models.get("models", []):
             model_id = model["name"].split("/")[-1]
-            
-            if model_id in self.filtered_models:
-                logger.info(f"Filtered out model: {model_id}")
-                continue
-                
             openai_model = {
                 "id": model_id,
                 "object": "model",