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/subscribe/page.tsx

@@ -0,0 +1,41 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@kit/ui/card';
+import { Input } from '@kit/ui/input';
+import { Label } from '@kit/ui/label';
+import { Button } from '@kit/ui/button';
+import { Mail } from 'lucide-react';
+
+interface Props { params: Promise<{ slug: string }> }
+
+export default async function NewsletterSubscribePage({ params }: Props) {
+  const { slug } = await params;
+
+  return (
+    <div className="min-h-screen bg-muted/30 flex items-center justify-center p-6">
+      <Card className="w-full max-w-md">
+        <CardHeader className="text-center">
+          <div className="mx-auto mb-4 flex h-12 w-12 items-center justify-center rounded-full bg-primary/10">
+            <Mail className="h-6 w-6 text-primary" />
+          </div>
+          <CardTitle>Newsletter abonnieren</CardTitle>
+          <p className="text-sm text-muted-foreground">Bleiben Sie über Neuigkeiten informiert.</p>
+        </CardHeader>
+        <CardContent>
+          <form className="space-y-4">
+            <div className="space-y-2">
+              <Label>Name (optional)</Label>
+              <Input name="name" placeholder="Max Mustermann" />
+            </div>
+            <div className="space-y-2">
+              <Label>E-Mail-Adresse *</Label>
+              <Input name="email" type="email" placeholder="ihre@email.de" required />
+            </div>
+            <Button type="submit" className="w-full">Abonnieren</Button>
+            <p className="text-xs text-center text-muted-foreground">
+              Sie können sich jederzeit abmelden. Wir senden Ihnen eine Bestätigungs-E-Mail.
+            </p>
+          </form>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}