Build Verse: a poem-quote app on the agent-native chat template

Adds a Postgres-backed quotes domain (poems/quotes/favorites) exposed as
five agent-native actions (list-quotes, get-random-quote, create-quote,
toggle-favorite, list-favorites) callable from both chat and the React UI
via useActionQuery/useActionMutation. Moves the primary UI from chat to a
mobile-first Quotes/Favorites experience (chat moves to /chat), adds
manual OpenTelemetry instrumentation exporting traces/metrics/logs over
OTLP, and wires a local Docker Postgres for shared state.

.env.example

@@ -3,3 +3,14 @@ PING_MESSAGE=pong
 
 # Skip login/signup (local dev / preview only)
 # AUTH_DISABLED=true
+
+# Persistent secret for auth sessions (generate with: openssl rand -hex 32)
+# BETTER_AUTH_SECRET=
+
+# Postgres connection (see docker-compose.yml for local Docker Postgres)
+# POSTGRES_PASSWORD=
+# DATABASE_URL=postgres://versequote:password@127.0.0.1:5434/versequote
+
+# Observability — OTLP http endpoint (Grafana LGTM / otel-collector)
+# OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
+# OTEL_SERVICE_NAME=verse-quote-app