Memby v0.1.53: Android TV client plus gateway

Android TV client for Emby (Kotlin, Compose for TV) and the Memby gateway
(Go, Postgres, Redis) that fronts it.

Client:
- Setup, profiles, home rows, Media3 playback, system screensaver (Dream)
- Backend chosen at build time: gateway when memby.gatewayUrl is set,
  otherwise direct to Emby. Both paths stay working.
- Server-composed home rows, rendered verbatim so new row types ship
  without an app release
- Full-screen animated maintenance state, row engagement telemetry

Gateway:
- One request per TV screen; auth, caching, search and row shaping
- Library import from Emby into Postgres (manual, then hourly incremental)
- Recommendations from viewing history (recency-weighted genre affinity)
- Admin page for imports, an offline switch, and per-row analytics
- Video always direct-plays from Emby; only metadata passes through

Identity is com.ponzischeme89.memby throughout, replacing
com.mattcohen.embyclientsname. A changed applicationId installs as a new
app: TVs need a fresh sign-in and the old package uninstalled.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,32 @@
+# Copy to .env next to docker-compose.yml and fill in. Never commit the real .env.
+
+# How the gateway container reaches Emby.
+MEMBY_EMBY_URL=https://molise.bounceme.net
+
+# What TVs are told to stream from. Only set this when it differs from the address
+# above — video goes device -> Emby directly, never through the gateway.
+#MEMBY_EMBY_PUBLIC_URL=https://molise.bounceme.net
+
+# Postgres password for the memby role. Generate one, e.g.
+#   openssl rand -base64 24
+POSTGRES_PASSWORD=change-me
+
+# Host port the gateway listens on.
+MEMBY_PORT=8080
+
+# How long a cached home payload stays warm.
+MEMBY_HOME_TTL=60s
+
+# Admin interface at http://<host>:8080/admin/ — library imports, the maintenance
+# switch, and row analytics. Leave blank to disable /admin entirely. Generate with
+#   openssl rand -hex 32
+MEMBY_ADMIN_TOKEN=
+
+# Library import. Hourly incremental keeps up with episodes added through the day.
+MEMBY_SYNC_INTERVAL=1h
+MEMBY_SYNC_ON_START=false
+
+# Optional Emby service account for imports. Without it the gateway borrows the most
+# recently active TV session, which works but stops if that user is removed.
+#MEMBY_SYNC_USER_ID=
+#MEMBY_SYNC_API_KEY=