chore: repo cleanup and prod sync tooling

- Remove stale deploy/docker-entrypoint.sh (Dockerfile copies root version)
- Remove scripts/seed.ts (superseded by seed.mjs)
- Add src/app/error.tsx and global-error.tsx (untracked error boundaries)
- Gitignore deploy/.prod/ for synced production configs
- Add scripts/sync-prod.ps1 to pull compose/env/Caddyfile from valhalla
- Add scripts/apply-compose.ps1 to push compose changes and restart services

src/app/error.tsx

@@ -0,0 +1,27 @@
+"use client";
+
+import { useEffect } from "react";
+
+export default function Error({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    console.error(error);
+  }, [error]);
+
+  return (
+    <div className="flex min-h-screen flex-col items-center justify-center gap-4 p-8">
+      <h2 className="text-xl font-semibold">Something went wrong</h2>
+      <button
+        onClick={reset}
+        className="rounded-md bg-primary px-4 py-2 text-sm text-primary-foreground hover:bg-primary/90"
+      >
+        Try again
+      </button>
+    </div>
+  );
+}