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]/club/[slug]/newsletter/unsubscribe/page.tsx

@@ -0,0 +1,37 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@kit/ui/card';
+import { Button } from '@kit/ui/button';
+import { MailX } from 'lucide-react';
+import Link from 'next/link';
+
+interface Props { params: Promise<{ slug: string }>; searchParams: Promise<{ token?: string }> }
+
+export default async function NewsletterUnsubscribePage({ params, searchParams }: Props) {
+  const { slug } = await params;
+  const { token } = await searchParams;
+
+  return (
+    <div className="min-h-screen bg-muted/30 flex items-center justify-center p-6">
+      <Card className="w-full max-w-md text-center">
+        <CardHeader>
+          <div className="mx-auto mb-4 flex h-12 w-12 items-center justify-center rounded-full bg-destructive/10">
+            <MailX className="h-6 w-6 text-destructive" />
+          </div>
+          <CardTitle>Newsletter abbestellen</CardTitle>
+        </CardHeader>
+        <CardContent className="space-y-4">
+          {token ? (
+            <>
+              <p className="text-sm text-muted-foreground">Möchten Sie den Newsletter wirklich abbestellen?</p>
+              <Button variant="destructive" className="w-full">Abbestellen bestätigen</Button>
+            </>
+          ) : (
+            <p className="text-sm text-muted-foreground">Kein gültiger Abmeldelink. Bitte verwenden Sie den Link aus der Newsletter-E-Mail.</p>
+          )}
+          <Link href={`/club/${slug}`}>
+            <Button variant="outline" size="sm">← Zurück zur Website</Button>
+          </Link>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}