初始提交：QQ 群入群验证机器人

基于 qqbotsdk-py 的入群验证：进群发按钮验证码、完成前禁言、
超时踢出（11253 时兜底长期禁言）、乱点他人按钮处罚、状态持久化
与重启恢复。38 个单元/集成测试。

start.bat

@@ -0,0 +1,29 @@
+@echo off
+rem AuthBot launcher - ASCII only: cmd parses batch files with the ANSI
+rem codepage, so non-ASCII text here gets mangled on Chinese Windows.
+title AuthBot - QQ Group Verify Bot
+cd /d "%~dp0"
+
+if not exist ".venv\Scripts\python.exe" (
+    echo [AuthBot] venv not found. Creating it and installing deps...
+    python -m venv .venv
+    if errorlevel 1 (
+        echo [AuthBot] Failed to create venv. Install Python 3.12+ and add it to PATH.
+        pause
+        exit /b 1
+    )
+    ".venv\Scripts\python.exe" -m pip install -r requirements.txt
+)
+
+if not exist ".env" (
+    echo [AuthBot] .env missing. Copy .env.example to .env and fill APPID / APPSECRET.
+    pause
+    exit /b 1
+)
+
+echo [AuthBot] starting...
+".venv\Scripts\python.exe" main.py
+
+echo.
+echo [AuthBot] exited. If this was unexpected, check the log above.
+pause