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/app/[locale]/home/[account]/site-builder/settings/page.tsx

@@ -2,6 +2,7 @@ import { getSupabaseServerClient } from '@kit/supabase/server-client';
 import { createSiteBuilderApi } from '@kit/site-builder/api';
 import { SiteSettingsForm } from '@kit/site-builder/components';
 import { CmsPageShell } from '~/components/cms-page-shell';
+import { AccountNotFound } from '~/components/account-not-found';
 
 interface Props { params: Promise<{ account: string }> }
 
@@ -9,7 +10,7 @@ export default async function SiteSettingsPage({ params }: Props) {
   const { account } = await params;
   const client = getSupabaseServerClient();
   const { data: acct } = await client.from('accounts').select('id').eq('slug', account).single();
-  if (!acct) return <div>Konto nicht gefunden</div>;
+  if (!acct) return <AccountNotFound />;
 
   const api = createSiteBuilderApi(client);
   const settings = await api.getSiteSettings(acct.id);