Production-ready overhaul: backend fixes, claim flow polish, SEO, mobile, nginx

Backend:
- Fix activity score (followersCount check), NIP-98 URL proto, wallet balance guard
- Add payment_hash to confirm response, spentTodaySats to stats
- Add idx_claims_ip_hash; security headers, graceful shutdown, periodic nonce cleanup

Frontend:
- Remove 8 legacy components; polish wizard (rules summary, profile card, confetti, share)
- Stats budget bar uses spentTodaySats; ErrorBoundary with reload

SEO & production:
- Full meta/OG/Twitter, favicon, JSON-LD, robots.txt, sitemap.xml
- Mobile CSS fixes; nginx static dist + gzip + cache + security headers
- Vite manualChunks; aria-labels, dynamic page titles

Made-with: Cursor

frontend/vite.config.ts

@@ -3,6 +3,18 @@ import react from "@vitejs/plugin-react";
 
 export default defineConfig({
   plugins: [react()],
+  build: {
+    sourcemap: false,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          vendor: ["react", "react-dom", "react-router-dom"],
+          nostr: ["nostr-tools"],
+          ui: ["framer-motion", "qrcode", "canvas-confetti"],
+        },
+      },
+    },
+  },
   preview: {
     allowedHosts: ["faucet.lnpulse.app"],
   },