feat: Frontend gap closure — Schedules, Alerts, Migration, Changelog views

Implements missing frontend views and API integrations:

New Views:
- SchedulesView: CRUD for scheduled tasks (restart/announcement/command/plugin_reload)
- MigrationView: Export/import interface with file upload and history tracking
- ChangelogView: Paginated changelog feed with category badges
- ForgotPasswordView: Password reset flow with email submission
- AlertsView: Alert config dashboard with threshold settings and history

Component Updates:
- ErrorBoundary: Global error handler with retry functionality
- DashboardLayout: Mobile responsive sidebar, permission-based nav, new menu items
- ServerInfoView: Complete rewrite for public server info display

Infrastructure:
- useApi: Token refresh interceptor with 401 retry and infinite loop prevention
- plugins store: Implemented all stubbed methods with real API calls
- auth store: Added hasPermission() helper for RBAC UI visibility
- Router: Added new routes with catch-all fallback

Purpose: Closes frontend implementation gaps. Hardens auth flow, improves mobile UX,
enables server automation scheduling, alert configuration, and data migration tools.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/router/index.ts

@@ -61,6 +61,12 @@ const panelRoutes: RouteRecordRaw[] = [
     component: () => import('@/views/auth/RegisterView.vue'),
     meta: { guest: true },
   },
+  {
+    path: '/forgot-password',
+    name: 'forgot-password',
+    component: () => import('@/views/auth/ForgotPasswordView.vue'),
+    meta: { guest: true },
+  },
   {
     path: '/setup',
     name: 'setup-wizard',
@@ -184,6 +190,26 @@ const panelRoutes: RouteRecordRaw[] = [
         name: 'settings',
         component: () => import('@/views/admin/SettingsView.vue'),
       },
+      {
+        path: 'schedules',
+        name: 'schedules',
+        component: () => import('@/views/admin/SchedulesView.vue'),
+      },
+      {
+        path: 'migration',
+        name: 'migration',
+        component: () => import('@/views/admin/MigrationView.vue'),
+      },
+      {
+        path: 'changelog',
+        name: 'changelog',
+        component: () => import('@/views/admin/ChangelogView.vue'),
+      },
+      {
+        path: 'alerts',
+        name: 'alerts',
+        component: () => import('@/views/admin/AlertsView.vue'),
+      },
       // Platform Admin views (super-admin only)
       {
         path: 'admin',
@@ -249,6 +275,12 @@ const panelRoutes: RouteRecordRaw[] = [
     name: 'status',
     component: () => import('@/views/public/StatusPageView.vue'),
   },
+
+  // Catch-all
+  {
+    path: '/:pathMatch(.*)*',
+    redirect: '/',
+  },
 ]
 
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