[claude] Connect API to real Lightning node (#12) (#64)

Co-authored-by: Claude (Opus 4.6) <claude@hermes.local>
Co-committed-by: Claude (Opus 4.6) <claude@hermes.local>

.env.example

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+# ============================================================
+# Timmy API Server — Environment Variables
+# Copy this file to .env and fill in your values.
+# Never commit .env to version control.
+# ============================================================
+
+# ── Server ───────────────────────────────────────────────────
+PORT=8080
+NODE_ENV=development
+
+# ── Lightning / LNbits ───────────────────────────────────────
+# Set both variables to connect the API to a real Lightning node.
+# Leave blank to run in stub mode (invoices simulated in-memory).
+#
+# After running infrastructure/lnd-init.sh on the droplet, it will
+# print both values. Copy them here.
+#
+# LNBITS_URL is the public HTTPS URL exposed via Tailscale Funnel,
+# e.g. https://<node-name>.tail12345.ts.net
+LNBITS_URL=
+LNBITS_API_KEY=
+
+# ── Database ─────────────────────────────────────────────────
+DATABASE_URL=postgresql://localhost:5432/timmy
+
+# ── Nostr identity ───────────────────────────────────────────
+# nsec for Timmy's Nostr keypair (signs relay events).
+# Generate with: openssl rand -hex 32
+TIMMY_NOSTR_NSEC=
+# Optional: override the derived pubkey explicitly (hex, not npub).
+TIMMY_NOSTR_PUBKEY=
+
+# ── AI integrations ──────────────────────────────────────────
+# Anthropic Claude — leave blank to use canned AI stub responses.
+AI_INTEGRATIONS_ANTHROPIC_API_KEY=
+
+# Gemini (optional)
+GEMINI_API_KEY=
+
+# ── CORS ─────────────────────────────────────────────────────
+# Comma-separated list of allowed origins in production.
+# Default: alexanderwhitestone.com variants.
+# Leave blank to allow all origins (development default).
+# CORS_ORIGINS=https://alexanderwhitestone.com,https://www.alexanderwhitestone.com
+
+# ── Relay policy ─────────────────────────────────────────────
+# Shared secret between the API server and the strfry relay-policy sidecar.
+RELAY_POLICY_SECRET=
+
+# ── Rate limiting / misc ─────────────────────────────────────
+# Milliseconds between moderation poll cycles (default: 30000).
+# MODERATION_POLL_MS=30000
+
+# ── BTC price oracle ─────────────────────────────────────────
+# Optional CoinGecko API key for higher rate limits.
+# COINGECKO_API_KEY=
+
+# ── Replit (auto-set in Replit environment) ──────────────────
+# REPLIT_DEV_DOMAIN=<auto-set by Replit>