fix: 提供更详细的报错提示并保持注释风格和原代码一致

src/common/database.py

@@ -16,11 +16,15 @@ def __create_database_instance():
     auth_source = os.getenv("MONGODB_AUTH_SOURCE")
 
     if uri:
-        # Support both standard mongodb:// and mongodb+srv:// connection strings
+        # 支持标准mongodb://和mongodb+srv://连接字符串
         if uri.startswith(("mongodb://", "mongodb+srv://")):
             return MongoClient(uri)
         else:
-            raise ValueError("Invalid MongoDB URI. Must start with 'mongodb://' or 'mongodb+srv://'")
+            raise ValueError(
+                "Invalid MongoDB URI format. URI must start with 'mongodb://' or 'mongodb+srv://'. "
+                "For MongoDB Atlas, use 'mongodb+srv://' format. "
+                "See: https://www.mongodb.com/docs/manual/reference/connection-string/"
+            )
 
     if username and password:
         # 如果有用户名和密码，使用认证连接