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>

Dockerfile.seed

@@ -0,0 +1,23 @@
+# Seeder container — populates the Nostr relay with test profiles,
+# reactions, and comments so the dev deployment has content.
+#
+# Runs once and exits. docker-compose "restart: no" keeps it from looping.
+
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install dependencies
+COPY package*.json ./
+RUN npm ci --ignore-scripts
+
+# Copy only what the seed scripts need
+COPY scripts/ ./scripts/
+COPY src/data/testPersonas.ts ./src/data/testPersonas.ts
+COPY tsconfig.json ./
+
+# Default env (overridden by docker-compose)
+ENV RELAY_URL=ws://relay:8080
+ENV ORIGIN=http://localhost:7777
+
+CMD ["sh", "-c", "node scripts/wait-for-relay.mjs && npx tsx scripts/seed-profiles.ts && npx tsx scripts/seed-activity.ts && echo '✅ Seeding complete!'"]