Initial commit: X-Plane G1000 web cockpit + bridge + Tauri desktop app

- server/: Node bridge (datarefs/commands, navdata, CIFP procedures, flight plan)
- web/: React cockpit (PFD/MFD/Map, VFR six-pack, AFCS, FMS CDU), PWA, collapsible sidebar
- desktop/: Tauri 2 launcher (Bun sidecar, system tray, updater) + Linux build via Docker
- scripts/: prep-desktop, build-linux, Gitea release + latest.json

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/public/manifest.webmanifest

@@ -0,0 +1,16 @@
+{
+  "name": "G1000 Glass Cockpit",
+  "short_name": "G1000",
+  "description": "X-Plane 12 G1000 glass cockpit — PFD / MFD / FMS over your LAN",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "landscape",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png" },
+    { "src": "/icons/icon-512-maskable.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}

web/public/sw.js

@@ -0,0 +1,31 @@
+// Minimal service worker: caches the app shell so the cockpit launches fast and
+// survives brief network blips. Live data (the bridge WebSocket, /api, and map
+// tiles) is never cached — only same-origin GET app assets.
+const CACHE = 'g1000-shell-v1';
+
+self.addEventListener('install', () => self.skipWaiting());
+
+self.addEventListener('activate', (e) => {
+  e.waitUntil(
+    caches.keys().then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', (e) => {
+  const url = new URL(e.request.url);
+  // Only same-origin GET app shell; skip the API and let the WS pass through.
+  if (e.request.method !== 'GET' || url.origin !== location.origin) return;
+  if (url.pathname.startsWith('/api') || url.pathname === '/ws') return;
+
+  // Stale-while-revalidate: serve cache fast, refresh in the background.
+  e.respondWith(
+    caches.open(CACHE).then(async (cache) => {
+      const cached = await cache.match(e.request);
+      const network = fetch(e.request)
+        .then((res) => { if (res && res.ok) cache.put(e.request, res.clone()); return res; })
+        .catch(() => cached);
+      return cached || network;
+    })
+  );
+});