feat: complete CMS v2 with Docker, Fischerei, Meetings, Verband modules + UX audit fixes

Major changes:
- Docker Compose: full Supabase stack (11 services) equivalent to supabase CLI
- Fischerei module: 16 DB tables, waters/species/stocking/catch books/competitions
- Sitzungsprotokolle module: meeting protocols, agenda items, task tracking
- Verbandsverwaltung module: federation management, member clubs, contacts, fees
- Per-account module activation via Modules page toggle
- Site Builder: live CMS data in Puck blocks (courses, events, membership registration)
- Public registration APIs: course signup, event registration, membership application
- Document generation: PDF member cards, Excel reports, HTML labels
- Landing page: real Com.BISS content (no filler text)
- UX audit fixes: AccountNotFound component, shared status badges, confirm dialog,
  pagination, duplicate heading removal, emoji→badge replacement, a11y fixes
- QA: healthcheck fix, API auth fix, enum mismatch fix, password required attribute

apps/web/components/account-not-found.tsx

@@ -0,0 +1,22 @@
+import Link from 'next/link';
+import { AlertTriangle } from 'lucide-react';
+import { Button } from '@kit/ui/button';
+
+export function AccountNotFound() {
+  return (
+    <div className="flex flex-col items-center justify-center py-24 text-center">
+      <div className="mb-4 rounded-full bg-destructive/10 p-4">
+        <AlertTriangle className="h-8 w-8 text-destructive" />
+      </div>
+      <h2 className="text-xl font-semibold">Konto nicht gefunden</h2>
+      <p className="mt-2 max-w-md text-sm text-muted-foreground">
+        Das angeforderte Konto existiert nicht oder Sie haben keine Berechtigung darauf zuzugreifen.
+      </p>
+      <div className="mt-6">
+        <Link href="/home">
+          <Button variant="outline">Zum Dashboard</Button>
+        </Link>
+      </div>
+    </div>
+  );
+}