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

packages/features/booking-management/src/server/api.ts

@@ -84,5 +84,15 @@ export function createBookingManagementApi(client: SupabaseClient<Database>) {
       if (error) throw error;
       return data;
     },
+
+    async createRoom(input: { accountId: string; roomNumber: string; name?: string; roomType?: string; capacity?: number; floor?: number; pricePerNight: number; description?: string }) {
+      const { data, error } = await client.from('rooms').insert({
+        account_id: input.accountId, room_number: input.roomNumber, name: input.name,
+        room_type: input.roomType ?? 'standard', capacity: input.capacity ?? 2,
+        floor: input.floor, price_per_night: input.pricePerNight, description: input.description,
+      }).select().single();
+      if (error) throw error;
+      return data;
+    },
   };
 }