refactor(structure): reorganize monorepo with projects, terraform hierarchy, and strict k8s namespace rules

projects/grabengasse/frontend/public/manifest.webmanifest

@@ -0,0 +1,26 @@
+{
+  "name": "Grabengasse 7 — 16-Bit Weather Station",
+  "short_name": "Grabengasse 7",
+  "description": "16-bit retro weather telemetry and simulation console for Grabengasse 7 in Regensburg.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "portrait-primary",
+  "background_color": "#0c101a",
+  "theme_color": "#0c101a",
+  "categories": ["weather", "utilities"],
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}

projects/grabengasse/frontend/public/sw.js

@@ -0,0 +1,85 @@
+const CACHE_NAME = 'grabengasse-v1.0';
+const STATIC_ASSETS = [
+  '/',
+  '/index.html',
+  '/manifest.webmanifest',
+  '/icon-192.png',
+  '/icon-512.png',
+  '/apple-touch-icon.png',
+  '/favicon.png'
+];
+
+// Install: Cache essential shell assets
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => {
+      return cache.addAll(STATIC_ASSETS);
+    }).then(() => self.skipWaiting())
+  );
+});
+
+// Activate: Clean up previous cache versions
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => {
+      return Promise.all(
+        keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))
+      );
+    }).then(() => self.clients.claim())
+  );
+});
+
+// Fetch: Network-first for API data, Stale-while-revalidate for static assets
+self.addEventListener('fetch', (event) => {
+  const { request } = event;
+  const url = new URL(request.url);
+
+  // API calls: Network first with no fallback caching of stale live metrics
+  if (url.pathname.startsWith('/api/')) {
+    event.respondWith(
+      fetch(request).catch(() => {
+        return new Response(JSON.stringify({ error: 'Offline / Telemetry Link Offline' }), {
+          status: 503,
+          headers: { 'Content-Type': 'application/json' }
+        });
+      })
+    );
+    return;
+  }
+
+  // Navigation requests: Network first, fallback to cached /index.html (SPA routing)
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request).catch(() => {
+        return caches.match('/index.html');
+      })
+    );
+    return;
+  }
+
+  // Static assets (CSS, JS, Fonts, Images): Cache-first with network fallback & cache update
+  event.respondWith(
+    caches.match(request).then((cachedResponse) => {
+      if (cachedResponse) {
+        // Fetch in background to update cache
+        fetch(request).then((networkResponse) => {
+          if (networkResponse && networkResponse.status === 200) {
+            caches.open(CACHE_NAME).then((cache) => cache.put(request, networkResponse));
+          }
+        }).catch(() => {});
+        return cachedResponse;
+      }
+
+      return fetch(request).then((networkResponse) => {
+        if (!networkResponse || networkResponse.status !== 200 || networkResponse.type !== 'basic') {
+          return networkResponse;
+        }
+        const responseToCache = networkResponse.clone();
+        caches.open(CACHE_NAME).then((cache) => {
+          cache.put(request, responseToCache);
+        });
+        return networkResponse;
+      });
+    })
+  );
+});