fix: Remove missing icon references and fix batch syntax

- Remove icon references from package.json (assets folder is empty)
- Fix batch script syntax by replacing if/else blocks with goto labels
- Remove parentheses and colons that conflict with batch syntax

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/package.json

@@ -50,15 +50,12 @@
           "arch": ["x64"]
         }
       ],
-      "icon": "assets/icon.ico",
       "signAndEditExecutable": false
     },
     "nsis": {
       "oneClick": false,
       "allowToChangeInstallationDirectory": true,
       "artifactName": "${productName}-${version}-setup.${ext}",
-      "installerIcon": "assets/icon.ico",
-      "uninstallerIcon": "assets/icon.ico",
       "deleteAppDataOnUninstall": false
     },
     "mac": {
@@ -67,8 +64,7 @@
           "target": "dmg",
           "arch": ["x64", "arm64"]
         }
-      ],
+      ]
-      "icon": "assets/icon.icns"
     },
     "linux": {
       "target": [
@@ -76,8 +72,7 @@
           "target": "AppImage",
           "arch": ["x64"]
         }
-      ],
+      ]
-      "icon": "assets/icon.png"
     },
     "portable": {
       "artifactName": "${productName}-${version}-portable.${ext}",

scripts/build-client.bat

@@ -473,19 +473,26 @@ dir /b "%BUILD_DIR%"
 echo.
 echo %GREEN%[OK]%NC% 打包完成！
 echo.
-if /i "%BUILD_TARGET%"=="nsis" (
+if /i "%BUILD_TARGET%"=="nsis" goto :show_nsis_help
-    echo   Windows 使用說明 (NSIS 安裝檔):
+goto :show_portable_help
+
+:show_nsis_help
+echo   Windows 使用說明 - NSIS 安裝檔
 echo   1. 找到 build\ 中的 *-setup.exe 檔案
 echo   2. 執行安裝檔，選擇安裝目錄
 echo   3. 安裝後從開始選單或桌面捷徑啟動
 echo   4. 資料會持久保存在安裝目錄中
-) else (
+goto :end_help
-    echo   Windows 使用說明 (Portable):
+
+:show_portable_help
+echo   Windows 使用說明 - Portable
 echo   1. 找到 build\ 中的 *-portable.exe 檔案
 echo   2. 直接執行，無需安裝
-    echo   3. 注意: 關閉程式後臨時檔案會清空
+echo   3. 注意 - 關閉程式後臨時檔案會清空
 echo   4. SQLite 資料庫保存在 %%APPDATA%%\Meeting-Assistant
-)
+goto :end_help
+
+:end_help
 echo.
 goto :eof