Add resumable uploads, proxy discovery, PWA install and 2 GiB personal vaults

apps/web/public/manifest.webmanifest

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+{
+  "id": "/",
+  "name": "hop. — 기기 사이를 가볍게.",
+  "short_name": "hop.",
+  "description": "가입 없이 주변 기기에 파일과 링크를 보내세요.",
+  "lang": "ko",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "icons": [
+    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-maskable.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}

apps/web/public/sw.js

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+// Network-only: no account records, files, tokens or API responses enter offline caches.
+self.addEventListener('install', (event) => event.waitUntil(self.skipWaiting()));
+self.addEventListener('activate', (event) => event.waitUntil(self.clients.claim()));
+self.addEventListener('fetch', (event) => {
+  if (event.request.method !== 'GET' || event.request.mode !== 'navigate') return;
+  event.respondWith(
+    fetch(event.request).catch(
+      () =>
+        new Response(
+          '<!doctype html><html lang="ko"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>hop.</title><body style="background:#000;color:#f5f5f5;font:16px system-ui;text-align:center;padding:25vh 24px"><h1>hop.</h1><p>인터넷 연결이 필요해요.</p><p>연결한 뒤 다시 열어주세요.</p><a href="/" style="color:inherit">다시 시도</a></body></html>',
+          {
+            status: 503,
+            headers: { 'Content-Type': 'text/html; charset=utf-8', 'Cache-Control': 'no-store' },
+          },
+        ),
+    ),
+  );
+});