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>

src/components/push-opt-in.tsx

@@ -8,8 +8,6 @@ import {
   sendTestNotification,
 } from "@/app/settings/push-actions";
 
-const VAPID_KEY = process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY ?? "";
-
 function urlBase64ToUint8Array(base64String: string): Uint8Array<ArrayBuffer> {
   const padding = "=".repeat((4 - (base64String.length % 4)) % 4);
   const base64 = (base64String + padding).replace(/-/g, "+").replace(/_/g, "/");
@@ -19,13 +17,13 @@ function urlBase64ToUint8Array(base64String: string): Uint8Array<ArrayBuffer> {
   return buf;
 }
 
-export function PushOptIn() {
+export function PushOptIn({ vapidKey }: { vapidKey: string }) {
   const [status, setStatus] = useState<"idle" | "subscribed" | "denied" | "unsupported">("idle");
   const [endpoint, setEndpoint] = useState<string | null>(null);
   const [isPending, startTransition] = useTransition();
   const [testSent, setTestSent] = useState(false);
 
-  if (!VAPID_KEY) return null;
+  if (!vapidKey) return null;
   if (!("serviceWorker" in navigator) || !("PushManager" in window)) {
     return (
       <p className="text-sm text-muted-foreground">
@@ -39,7 +37,7 @@ export function PushOptIn() {
       const registration = await navigator.serviceWorker.ready;
       const sub = await registration.pushManager.subscribe({
         userVisibleOnly: true,
-        applicationServerKey: urlBase64ToUint8Array(VAPID_KEY),
+        applicationServerKey: urlBase64ToUint8Array(vapidKey),
       });
       const json = sub.toJSON() as { endpoint: string; keys: { p256dh: string; auth: string } };
       startTransition(async () => {