feat(M0): MCP 手机控制 Server 骨架——FastMCP HTTP 传输（8033），平台登录会话+CSRF 封装，de_list_devices/de_screenshot(图像块)/de_tap/de_swipe，写门控/白名单/审计，实测全链路通过

mcp_server/audit.py

@@ -0,0 +1,27 @@
+"""审计日志：每次 MCP 调用记录一行（含只读）。"""
+import json
+import os
+from datetime import datetime
+
+_file = None
+
+
+def init(path):
+    global _file
+    os.makedirs(os.path.dirname(path), exist_ok=True)
+    _file = open(path, "a", encoding="utf-8")
+    audit("system", "startup", "", "")
+
+
+def audit(tool, serial, args_summary, result):
+    global _file
+    if _file is None:
+        return
+    rec = {"ts": datetime.now().isoformat(timespec="seconds"),
+           "tool": tool, "serial": serial,
+           "args": str(args_summary)[:200], "result": str(result)[:200]}
+    try:
+        _file.write(json.dumps(rec, ensure_ascii=False) + "\n")
+        _file.flush()
+    except Exception:
+        pass