Production-ready wiring: VAPID prop fix, port mappings, AUTH_URL

- PushOptIn now accepts vapidKey as a prop from its server-component
  parent (settings page reads VAPID_PUBLIC_KEY at runtime) — eliminates
  the NEXT_PUBLIC_* build-time dependency so pre-built GHCR images work
  without a build arg.
- deploy/compose.yaml: famapp exposes 3010:3000, authentik-server exposes
  9200:9000 so the existing Caddy stack can proxy by IP, matching every
  other service in the homelab.  NEXT_PUBLIC_APP_URL replaced by AUTH_URL
  (correct next-auth v5 var).
- deploy/Caddyfile.snippet: updated to 192.168.1.69:3010 / :9200.
- .env.production.example: AUTH_URL, ntfy pre-wired to ntfy.ginnoir.com,
  VAPID_SUBJECT prefilled with real email.
- typecheck and pnpm build both pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.production.example

@@ -10,8 +10,8 @@ AUTHENTIK_IMAGE_TAG=2024.12.3
 # Run drizzle migrations on container start. Leave true.
 RUN_MIGRATIONS=true
 
-# Public URL for the app (used in share links, OIDC redirect URIs, etc.)
-NEXT_PUBLIC_APP_URL=https://fam.ginnoir.com
+# Public URL for the app — used by Auth.js for OIDC redirect URIs.
+AUTH_URL=https://fam.ginnoir.com
 
 # famapp Postgres credentials (used to build DATABASE_URL inside compose.yaml)
 FAMAPP_DB_USER=famapp
@@ -21,20 +21,21 @@ FAMAPP_DB_NAME=famapp
 # Auth.js session secret — generate with: openssl rand -base64 32
 AUTH_SECRET=replace-with-openssl-rand-base64-32
 
-# OIDC provider (Authentik) — task 06 will fill these in after bootstrapping
+# OIDC provider (Authentik) — fill in after bootstrapping Authentik
 AUTH_OIDC_ISSUER=https://auth.ginnoir.com/application/o/famapp/
 AUTH_OIDC_CLIENT_ID=replace-me
 AUTH_OIDC_CLIENT_SECRET=replace-me
 
-# Web Push VAPID keys — generate with: pnpm vapid:generate
+# Web Push VAPID keys — generate with: pnpm vapid:generate (run from the repo)
 VAPID_PUBLIC_KEY=
 VAPID_PRIVATE_KEY=
 # Must be "mailto:<address>" or a URL
-VAPID_SUBJECT=mailto:you@example.com
+VAPID_SUBJECT=mailto:3nigma.matt@gmail.com
 
-# ntfy (optional push fallback — leave blank to disable)
-NTFY_URL=
-NTFY_TOPIC=
+# ntfy push fallback — uses your existing ntfy instance at ntfy.ginnoir.com
+# Leave NTFY_URL blank to disable ntfy fanout.
+NTFY_URL=https://ntfy.ginnoir.com
+NTFY_TOPIC=famapp
 
 # Log level: error | warn | info | debug
 LOG_LEVEL=info