feat(server): 添加图片生成服务和配置更新

server/app/config.py

@@ -36,6 +36,12 @@ class Settings(BaseSettings):
     wx_appid: str = ""
     wx_secret: str = ""
     
+    # 微信云托管配置
+    wx_cloud_env: str = ""
+    
+    # Gemini 图片生成配置
+    gemini_api_key: str = ""
+    
     # JWT 配置
     jwt_secret_key: str = "your-super-secret-key-change-in-production"
     jwt_expire_hours: int = 168  # 7天