Remove PWA/SW and fix blocking startup I/O

- Remove vite-plugin-pwa and all service worker code. The app no longer
  registers a service worker; legacy SWs are unregistered on load.
- Move snapshot parsing (thousands of sync Path.exists() calls) into a
  thread pool via asyncio.to_thread() so the health check responds
  immediately on startup.
- Wrap aiopathlib AsyncPath.iterdir() (sync os.scandir under the hood)
  in asyncio.to_thread() in scanner and scanning modules so directory
  walks do not monopolize the event loop.

frontend/package.json

@@ -17,7 +17,6 @@
     "@vitejs/plugin-vue": "^5.0.0",
     "typescript": "^5.3.0",
     "vite": "^5.0.0",
-    "vite-plugin-pwa": "^1.3.0",
     "vue-tsc": "^2.0.0"
   }
 }

frontend/src/main.ts

@@ -11,10 +11,13 @@ installInputModalityTracking()
 installKeyboardNavigation()
 installGamepadNavigation()
 
-if ('serviceWorker' in navigator && !navigator.serviceWorker.controller) {
-	navigator.serviceWorker.addEventListener('controllerchange', () => {
-		window.location.reload()
-	}, { once: true })
+// Unregister any legacy service workers — MediaHive no longer uses a PWA/SW.
+if ('serviceWorker' in navigator) {
+	navigator.serviceWorker.getRegistrations().then((registrations) => {
+		for (const registration of registrations) {
+			registration.unregister()
+		}
+	})
 }
 
 createApp(App).use(router).mount('#app')

frontend/src/pwa.ts

@@ -1,8 +0,0 @@
-import { registerSW } from 'virtual:pwa-register'
-
-export function registerMediaHivePwa(): void {
-  const updateServiceWorker = registerSW({
-    immediate: true,
-    onNeedRefresh: () => void updateServiceWorker(true),
-  })
-}

frontend/src/vite-env.d.ts

@@ -1,5 +1,4 @@
 /// <reference types="vite/client" />
-/// <reference types="vite-plugin-pwa/client" />
 
 declare module '*.vue' {
   import type { DefineComponent } from 'vue'

frontend/vite.config.ts

@@ -1,6 +1,5 @@
 import { defineConfig } from "vite";
 import vue from "@vitejs/plugin-vue";
-import { VitePWA } from "vite-plugin-pwa";
 import fastapiVue from './vite-plugin-fastapi.js'
 
 // https://vitejs.dev/config/
@@ -8,52 +7,6 @@ export default defineConfig(async () => ({
   plugins: [
     fastapiVue(),
     vue(),
-    VitePWA({
-      registerType: "autoUpdate",
-      injectRegister: "script",
-      manifest: {
-        id: "/",
-        name: "MediaHive",
-        short_name: "MediaHive",
-        description: "Movies and Series",
-        start_url: "/",
-        scope: "/",
-        display_override: ["window-controls-overlay", "fullscreen", "standalone"],
-        display: "fullscreen",
-        background_color: "#0a0a0a",
-        theme_color: "#0a0a0a",
-        icons: [
-          {
-            src: "/mediahive-32.webp",
-            sizes: "32x32",
-            type: "image/webp"
-          },
-          {
-            src: "/mediahive.webp",
-            sizes: "192x192",
-            type: "image/webp"
-          }
-        ]
-      },
-      workbox: {
-        cleanupOutdatedCaches: true,
-        clientsClaim: true,
-        skipWaiting: true,
-        manifestTransforms: [
-          async (entries) => {
-            const manifest = entries.map((entry) =>
-              entry.url === "index.html" ? { ...entry, url: "/" } : entry
-            );
-            return { manifest, warnings: [] };
-          },
-        ],
-        navigateFallback: null,
-        navigateFallbackDenylist: [/^\/api\//],
-      },
-      devOptions: {
-        enabled: false,
-      },
-    }),
   ],
 
   // Vite dev server options