refactor(app): 删除过时的app.js备份文件

移除 _assistant_backups 目录中的 app.js.bak_2026-05-05_0451 备份文件，
该文件包含完整的JavaScript应用程序代码，包括全局状态管理、工具函数、
日志系统、连接管理、CAN帧发送、文件处理、固件上传等功能模块。

tools/serve.bat

@@ -0,0 +1,21 @@
+@echo off
+:: ESP32 COMM Host Server Launcher (Windows)
+:: Double-click to start, then visit http://localhost:8080
+
+set PORT=8080
+
+echo ========================================
+echo   ESP32 COMM Host Server
+echo   PORT: %PORT%
+echo ========================================
+echo.
+echo   WiFi OTA:   http://localhost:%PORT%/index.html
+echo   BLE  OTA:   http://localhost:%PORT%/ble_ota.html
+echo.
+echo   Press Ctrl+C to stop
+echo ========================================
+echo.
+
+cd /d "%~dp0"
+python -m http.server %PORT%
+pause