Add PWA support with offline-first caching (v0.43.1)

- Add web app manifest for standalone installation
- Add service worker with offline-first caching for static assets
- Add network-first caching with fallback for API calls
- Generate PWA icons (192x192, 512x512) from favicon
- Add Apple PWA meta tags for iOS support
- Update rollup config to copy PWA files to dist

Files modified:
- app/web/public/manifest.json: New PWA manifest
- app/web/public/sw.js: New service worker
- app/web/public/icon-192.png: New PWA icon
- app/web/public/icon-512.png: New PWA icon
- app/web/public/index.html: Add manifest link, meta tags, SW registration
- app/web/rollup.config.js: Add PWA files to copy targets
- pkg/version/version: Bump to v0.43.1

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/web/public/manifest.json

@@ -0,0 +1,22 @@
+{
+  "name": "ORLY Nostr Relay",
+  "short_name": "ORLY",
+  "description": "High-performance Nostr relay",
+  "display": "standalone",
+  "start_url": "/",
+  "scope": "/",
+  "theme_color": "#000000",
+  "background_color": "#000000",
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}