feat: add SFX volume control and improve audio feedback

- Implemented separate sound effects volume control in settings.
- Updated backend to handle new `sfx_volume` parameter.
- Enhanced UI to include sound effects volume slider in admin panel.
- Integrated sound effects for various user interactions (clicks, navigation, alerts).
- Added a new global sound engine to manage audio synthesis without external files.
- Updated documentation for Docker deployment and Windows packaging.
- Refactored audio context management to ensure sound effects are available post user interaction.

scripts/build-win.cmd

@@ -0,0 +1,40 @@
+@echo off
+REM ============================================================
+REM  Windows 一键打包脚本（Tauri）
+REM  解决「error: failed to remove file ... .exe / 拒绝访问(os error 5)」：
+REM  本应用关闭窗口=最小化（进程常驻），旧 exe 会被运行进程锁定无法覆盖。
+REM  打包前自动结束占用进程，再执行 tauri build。
+REM
+REM  用法：双击运行，或在项目根目录执行  scripts\build-win.cmd
+REM ============================================================
+chcp 65001 >nul
+setlocal
+
+echo.
+echo [1/3] 结束占用旧 exe 的进程（无则跳过）...
+taskkill /f /im "昆明大学生创业园展播系统.exe" >nul 2>&1
+taskkill /f /im "云超服昆创园OPC运营中心.exe" >nul 2>&1
+taskkill /f /im "dpm.exe" >nul 2>&1
+echo       已尝试清理。
+
+echo.
+echo [2/3] 清理 Rust 增量产物中的旧 exe 残留（可选，失败不影响）...
+if exist "src-tauri\target\release\昆明大学生创业园展播系统.exe" (
+    del /f /q "src-tauri\target\release\昆明大学生创业园展播系统.exe" >nul 2>&1
+)
+
+echo.
+echo [3/3] 开始 Tauri 打包（yarn tauri build）...
+call yarn tauri build
+if errorlevel 1 (
+    echo.
+    echo [错误] 打包失败。若仍报「拒绝访问」，请：
+    echo   1. 确认任务管理器中没有 dpm/昆明大学生创业园 相关进程
+    echo   2. 将 D:\MyCode\DPM\src-tauri\target 加入杀毒软件排除目录
+    echo   3. 关闭杀毒实时防护后重试
+    exit /b 1
+)
+
+echo.
+echo [完成] 打包成功！安装包位于 src-tauri\target\release\bundle\
+endlocal