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

pnpm-workspace.yaml

@@ -15,11 +15,13 @@ catalog:
   '@manypkg/cli': ^0.25.1
   '@markdoc/markdoc': ^0.5.6
   '@marsidev/react-turnstile': ^1.4.2
+  '@measured/puck': ^0.20.2
   '@modelcontextprotocol/sdk': 1.28.0
   '@next/bundle-analyzer': 16.2.1
   '@nosecone/next': 1.3.0
   '@playwright/test': ^1.58.2
   '@react-email/components': 1.0.10
+  '@react-pdf/renderer': ^4.3.2
   '@sentry/nextjs': 10.46.0
   '@stripe/react-stripe-js': 5.6.1
   '@stripe/stripe-js': 8.11.0
@@ -34,6 +36,7 @@ catalog:
   '@turbo/gen': ^2.8.20
   '@types/node': 25.5.0
   '@types/nodemailer': 7.0.11
+  '@types/papaparse': ^5.5.2
   '@types/react': 19.2.14
   '@types/react-dom': 19.2.3
   babel-plugin-react-compiler: 1.0.0