feat: 添加搜索模型配置并改进Markdown链接处理

在Dockerfile中添加SEARCH_MODELS环境变量，支持gemini-2.0-flash-exp和gemini-2.0-pro-exp模型
改进message_converter中的图片链接正则表达式

Dockerfile

@@ -12,6 +12,7 @@ ENV ALLOWED_TOKENS='["your_token_1"]'
 ENV BASE_URL=https://generativelanguage.googleapis.com/v1beta
 ENV TOOLS_CODE_EXECUTION_ENABLED=false
 ENV IMAGE_MODELS='["gemini-2.0-flash-exp"]'
+ENV SEARCH_MODELS='["gemini-2.0-flash-exp","gemini-2.0-pro-exp"]'
 
 # Expose port
 EXPOSE 8000

app/services/chat/message_converter.py

@@ -7,7 +7,7 @@ import requests
 import base64
 
 SUPPORTED_ROLES = ["user", "model", "system"]
-IMAGE_URL_PATTERN = r'\[image\]\((.*?)\)'
+IMAGE_URL_PATTERN = r'\[(.*?)\]\((.*?)\)'
 
 
 class MessageConverter(ABC):
@@ -87,7 +87,7 @@ def _process_text_with_image(text: str) -> List[Dict[str, Any]]:
     img_url_match = re.search(IMAGE_URL_PATTERN, text)
     if img_url_match:
         # 提取URL
-        img_url = img_url_match.group(1)
+        img_url = img_url_match.group(2)
         # 将URL对应的图片转换为base64
         try:
             base64_data = _convert_image_to_base64(img_url)

app/services/chat/response_handler.py

@@ -205,7 +205,7 @@ def _extract_image_data(part: dict) -> str:
     current_date = time.strftime("%Y/%m/%d")
     filename = f"{current_date}/{uuid.uuid4().hex[:8]}.png"
     base64_data = part["inlineData"]["data"]
-                #将base64_data转成bytes数组
+    #将base64_data转成bytes数组
     bytes_data = base64.b64decode(base64_data)
     upload_response = image_uploader.upload(bytes_data,filename)
     if upload_response.success: