fix: 修复托盘菜单语法错误与激活页缺失，完善 Windows 打包流程

- electron/main.cjs: 修复托盘菜单损坏的合并代码（SyntaxError），托盘 3D 意识空间与 ipc 路由改用正确的 backendPort 变量
- 新增 activation.html 激活页（对接 /activate 接口，支持自动识别/8 个服务商）
- scripts/package-win.ps1: 打包前切换 better-sqlite3 到 Electron ABI、打包后还原 Node ABI，避免 dev 后端崩溃；内置 npmmirror 工具链镜像
- scripts/gen-icons.ps1 + build/icon.ico: 生成安装包图标（electron-builder 必需）
- package.json: build 脚本改用 package-win.ps1（不再依赖 VS 工具链）

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

package.json

@@ -14,7 +14,7 @@
     "start:backend": "node --env-file=.env src/index.js",
     "start:backend:lan": "powershell -ExecutionPolicy Bypass -File scripts/start-lan.ps1 backend",
     "dev": "node --env-file=.env --watch src/index.js",
-    "build": "powershell -ExecutionPolicy Bypass -File scripts/prebuild-clean.ps1 && electron-rebuild -f -w better-sqlite3 -v 33.4.11 && electron-builder --win",
+    "build": "powershell -ExecutionPolicy Bypass -File scripts/prebuild-clean.ps1 && powershell -ExecutionPolicy Bypass -File scripts/package-win.ps1",
     "publish": "electron-builder --win --publish always",
     "postinstall": "electron-builder install-app-deps",
     "test:rule-context": "electron ./src/test-rule-context.js",