feat: 接入托盘 / 添加图标生成工具 / 重命名并完善前端

- 托盘：用 getlantern/systray 重写 internal/tray，支持显示/隐藏窗口与退出
- 图标：新增 pkg/icongen 工具，支持 png/jpg/gif/bmp/webp，输出 ico/png 多个尺寸
- 重命名：项目默认名改为「青梧映星」，wails.json/productname/companyname/copyright 同步更新
- 顶栏：新增顶部导航栏（主题切换、设置、用户），iconfont 自托管 fa-solid-900.woff2
- 主题：CSS 变量 + html[data-theme] 控制白昼/黑夜切换，同时调用 WindowSetDarkTheme/LightTheme
- 底部：版权栏包含工作室、开发者与点击跳转客服链接
- 打包：wails build + exe 版本更新至 1.20 MB

frontend/package-lock.json

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@@ -1295,7 +1293,6 @@
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@@ -1599,7 +1595,6 @@
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@@ -1766,7 +1761,6 @@
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       "dev": true,
       "license": "MIT",
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       "dependencies": {
         "esbuild": "^0.27.0 || ^0.28.0",
         "fdir": "^6.5.0",