添加获取CNB网址的工具函数，更新主程序以打印运行网址，新增requirements.txt文件，优化前端页面布局和样式，增加移动端菜单功能。

utils/tools.py

@@ -0,0 +1,22 @@
+import requests
+import time
+import re
+
+s = requests.Session()
+
+def get_cnb_weburl(port):
+    s.headers= {"Authorization": "2hk178fffIx8tdXLD9YjYJot0gA"}
+
+    res = s.get("https://api.cnb.cool/workspace/list?branch=main&status=running").json()
+    info = res["list"][0]
+    urlinfo = s.get(f"https://api.cnb.cool/{info['slug']}/-/workspace/detail/{info['sn']}").json()
+
+    #re提取cnb-id
+    pattern = r'cnb-[a-z0-9]+-[a-z0-9]+-\d+'
+    match = re.search(pattern, urlinfo["webide"])
+    if match:
+        cnb_id = match.group(0)
+    else:
+        cnb_id = None
+
+    return f"https://{cnb_id}-{port}.cnb.run/"