fix: rewrite startup scripts with reliable helpers, stderr logging, visible windows

- Replace /MIN (hidden window) with normal windows so errors are visible
- Redirect stderr to logs/*.log for post-mortem
- Extract killport/wait_health/wait_port into callable helpers
- Use !N! (delayed expansion) for retry counters
- stop.bat now shows which PIDs it kills with port labels
- Remove nested-quote issue by cd'ing before npm start

stop.bat

@@ -1,8 +1,27 @@
 @echo off
 chcp 65001 >nul
-echo [清理] 停止所有 agent_jrxml 服务...
-for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":8000.*LISTENING"') do taskkill /F /PID %%a 2>nul
-for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":8001.*LISTENING"') do taskkill /F /PID %%a 2>nul
-for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":5173.*LISTENING"') do taskkill /F /PID %%a 2>nul
+echo ================================================
+echo   停止所有 agent_jrxml 服务
+echo ================================================
+
+echo [停止] 按窗口标题清理...
+taskkill /F /FI "WINDOWTITLE eq jrxml-validator*" 2>nul
+taskkill /F /FI "WINDOWTITLE eq jrxml-api*" 2>nul
+taskkill /F /FI "WINDOWTITLE eq jrxml-frontend*" 2>nul
+
+echo [停止] 按端口清理...
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":8000.*LISTENING"') do (
+    echo   端口 8000 - PID %%a
+    taskkill /F /PID %%a >nul 2>&1
+)
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":8001.*LISTENING"') do (
+    echo   端口 8001 - PID %%a
+    taskkill /F /PID %%a >nul 2>&1
+)
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":5173.*LISTENING"') do (
+    echo   端口 5173 - PID %%a
+    taskkill /F /PID %%a >nul 2>&1
+)
+
 echo 已停止
 pause