feat: implement server self-upgrade functionality

- Added update service to fetch the latest server release from GitHub.
- Implemented server upgrade scheduling and execution logic.
- Created platform-specific restart mechanisms for Unix and Windows.
- Introduced API endpoints for fetching the latest release and triggering upgrades.
- Developed UI components for version upgrade modal, including loading and error states.
- Updated documentation to reflect new upgrade features and instructions.
- Refactored settings types to streamline interface definitions.

atsf_server/web/components/layout/public-shell.tsx

@@ -14,14 +14,9 @@ export function PublicShell({ children }: PublicShellProps) {
       <div className='w-full max-w-3xl rounded-[var(--radius-xl)] border border-[var(--border-default)] bg-[var(--surface-panel)]/85 p-8 shadow-[var(--shadow-soft)] backdrop-blur'>
         <div className='mb-8 flex flex-col gap-4 border-b border-[var(--border-default)] pb-6 md:flex-row md:items-end md:justify-between'>
           <div>
-            <p className='text-sm font-medium uppercase tracking-[0.24em] text-[var(--brand-primary)]'>ATSFlare</p>
-            <h1 className='mt-2 text-3xl font-semibold text-[var(--foreground-primary)]'>欢迎使用 ATSFlare 管理端</h1>
-            <p className='mt-2 text-sm leading-6 text-[var(--foreground-secondary)]'>
-              当前已接入认证入口、核心业务模块以及阶段 4 的设置、用户、文件与关于页迁移。
-            </p>
+            <p className='text-3xl font-medium text-[var(--brand-primary)]'>ATSFlare</p>
           </div>
           <div className='flex flex-col items-start gap-3 text-sm text-[var(--foreground-secondary)] md:items-end'>
-            <ThemeToggle />
             <span className='rounded-full border border-[var(--border-default)] px-3 py-1.5'>
               {publicEnv.appVersion}
             </span>
@@ -33,10 +28,10 @@ export function PublicShell({ children }: PublicShellProps) {
         <div className='mt-8 border-t border-[var(--border-default)] pt-6 text-sm text-[var(--foreground-secondary)]'>
           <div className='flex flex-wrap gap-4'>
             <Link href='/' className='text-[var(--brand-primary)] transition hover:opacity-80'>
-              返回新版总览
+              返回
             </Link>
             <Link href='/about' className='text-[var(--brand-primary)] transition hover:opacity-80'>
-              查看关于页
+              关于
             </Link>
           </div>
         </div>