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>

scripts/wait-for-relay.mjs

@@ -0,0 +1,40 @@
+/**
+ * Waits for the Nostr relay to be reachable before seeding.
+ * Used by the Docker seeder container.
+ *
+ * Usage: node scripts/wait-for-relay.mjs
+ * Env:   RELAY_URL (default ws://localhost:7777)
+ */
+import http from 'node:http'
+
+const wsUrl = process.env.RELAY_URL || 'ws://localhost:7777'
+const httpUrl = wsUrl.replace('ws://', 'http://').replace('wss://', 'https://')
+const maxAttempts = 30
+const intervalMs = 2000
+
+console.log(`Waiting for relay at ${httpUrl} ...`)
+
+for (let i = 1; i <= maxAttempts; i++) {
+  const ok = await new Promise((resolve) => {
+    const req = http.get(httpUrl, (res) => {
+      res.resume() // drain response
+      resolve(res.statusCode >= 200 && res.statusCode < 400)
+    })
+    req.on('error', () => resolve(false))
+    req.setTimeout(3000, () => {
+      req.destroy()
+      resolve(false)
+    })
+  })
+
+  if (ok) {
+    console.log(`Relay is ready! (attempt ${i}/${maxAttempts})`)
+    process.exit(0)
+  }
+
+  console.log(`  attempt ${i}/${maxAttempts} — not ready yet`)
+  await new Promise((r) => setTimeout(r, intervalMs))
+}
+
+console.error(`Relay did not become ready after ${maxAttempts} attempts`)
+process.exit(1)