feat: MyEasyCMS v2 — Full SaaS rebuild

Complete rebuild of 22-year-old PHP CMS as modern SaaS:

Database (15 migrations, 42+ tables):
- Foundation: account_settings, audit_log, GDPR register, cms_files
- Module Engine: modules, fields, records, permissions, relations + RPC
- Members: 45+ field member profiles, departments, roles, honors, SEPA mandates
- Courses: courses, sessions, categories, instructors, locations, attendance
- Bookings: rooms, guests, bookings with availability
- Events: events, registrations, holiday passes
- Finance: SEPA batches/items (pain.008/001 XML), invoices
- Newsletter: campaigns, templates, recipients, subscriptions
- Site Builder: site_pages (Puck JSON), site_settings, cms_posts
- Portal Auth: member_portal_invitations, user linking

Feature Packages (9):
- @kit/module-builder — dynamic low-code CRUD engine
- @kit/member-management — 31 API methods, 21 actions, 8 components
- @kit/course-management, @kit/booking-management, @kit/event-management
- @kit/finance — SEPA XML generator + IBAN validator
- @kit/newsletter — campaigns + dispatch
- @kit/document-generator — PDF/Excel/Word
- @kit/site-builder — Puck visual editor, 15 blocks, public rendering

Pages (60+):
- Dashboard with real stats from all APIs
- Full CRUD for all 8 domains with react-hook-form + Zod
- Recharts statistics
- German i18n throughout
- Member portal with auth + invitation system
- Public club websites via Puck at /club/[slug]

Infrastructure:
- Dockerfile (multi-stage, standalone output)
- docker-compose.yml (Supabase self-hosted + Next.js)
- Kong API gateway config
- .env.production.example

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

@@ -0,0 +1,22 @@
+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';
+
+interface Props { params: Promise<{ account: string }> }
+
+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>;
+
+  const api = createSiteBuilderApi(client);
+  const settings = await api.getSiteSettings(acct.id);
+
+  return (
+    <CmsPageShell account={account} title="Website-Einstellungen" description="Design und Kontaktdaten">
+      <SiteSettingsForm accountId={acct.id} account={account} settings={settings} />
+    </CmsPageShell>
+  );
+}