Add Nostr relay + seed data to Docker deployment

- Add nostr-rs-relay service to docker-compose for persistent
  comments, reactions, and profiles on the dev server
- Add one-shot seeder container that auto-populates the relay
  with test personas, reactions, and comments on first deploy
- Proxy WebSocket connections through nginx at /relay so the
  frontend connects to the relay on the same host (no CORS)
- Make relay URL dynamic: reads from VITE_NOSTR_RELAYS in dev,
  auto-detects /relay proxy path in production Docker builds
- Make seed scripts configurable via RELAY_URL and ORIGIN env vars
- Add wait-for-relay script for reliable container orchestration
- Add "Resume last played" hero banner on My List tab

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/relay.ts

@@ -9,8 +9,27 @@ import { RelayPool } from 'applesauce-relay'
 // Relay pool for all WebSocket connections
 export const pool = new RelayPool()
 
-// App relays (local dev relay)
-export const APP_RELAYS = ['ws://localhost:7777']
+/**
+ * Determine app relay URLs at runtime.
+ *
+ * Priority:
+ * 1. VITE_NOSTR_RELAYS env var (set in .env for local dev)
+ * 2. Auto-detect: proxy through same host at /relay (Docker / production)
+ */
+function getAppRelays(): string[] {
+  const envRelays = import.meta.env.VITE_NOSTR_RELAYS as string | undefined
+  if (envRelays) {
+    const parsed = envRelays.split(',').map((r: string) => r.trim()).filter(Boolean)
+    if (parsed.length > 0) return parsed
+  }
+
+  // Production / Docker: relay is proxied through nginx at /relay
+  const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:'
+  return [`${protocol}//${window.location.host}/relay`]
+}
+
+// App relays (local dev relay or proxied production relay)
+export const APP_RELAYS = getAppRelays()
 
 // Lookup relays for profile metadata
 export const LOOKUP_RELAYS = ['wss://purplepag.es']