fix: 修复前后端启动问题，添加 BACKEND_PORT 配置

frontend/src/__init__.py

@@ -3,7 +3,7 @@ AI Agent 前端模块
 采用分层架构设计，包含配置、状态、API客户端和UI组件
 """
 
-from .logger import debug, info, warning, error
+from logger import debug, info, warning, error
 
 __version__ = "2.0.0"
 __all__ = ["debug", "info", "warning", "error"]

frontend/src/api_client.py

@@ -8,8 +8,8 @@ from typing import List, Dict, Any, Generator
 import requests
 
 # 使用相对导入
-from .config import config
-from .logger import error, warning
+from config import config
+from logger import error, warning
 
 
 class APIClient:

frontend/src/components/chat_area.py

@@ -6,10 +6,9 @@
 import re
 import streamlit as st
 
-# 使用相对导入
-from ..state import AppState
-from ..api_client import api_client
-from ..config import config
+from state import AppState
+from api_client import api_client
+from config import config
 
 
 def render_chat_area():

frontend/src/components/info_panel.py

@@ -5,8 +5,7 @@
 
 import streamlit as st
 
-# 使用相对导入
-from ..state import AppState
+from state import AppState
 
 
 def render_info_panel():

frontend/src/components/sidebar.py

@@ -6,9 +6,8 @@
 import streamlit as st
 from datetime import datetime
 
-# 使用相对导入
-from ..state import AppState
-from ..api_client import api_client
+from state import AppState
+from api_client import api_client
 
 def render_sidebar():
     """渲染左侧栏"""

frontend/src/logger.py

@@ -4,7 +4,7 @@
 """
 
 import os
-from .config import config
+from config import config
 import logging
 from typing import Any
 from dotenv import load_dotenv

frontend/src/state.py

@@ -7,7 +7,7 @@ import uuid
 from typing import List, Dict, Any
 import streamlit as st
 
-from .config import config
+from config import config
 
 
 class AppState: