feat: complete CMS v2 with Docker, Fischerei, Meetings, Verband modules + UX audit fixes

Major changes:
- Docker Compose: full Supabase stack (11 services) equivalent to supabase CLI
- Fischerei module: 16 DB tables, waters/species/stocking/catch books/competitions
- Sitzungsprotokolle module: meeting protocols, agenda items, task tracking
- Verbandsverwaltung module: federation management, member clubs, contacts, fees
- Per-account module activation via Modules page toggle
- Site Builder: live CMS data in Puck blocks (courses, events, membership registration)
- Public registration APIs: course signup, event registration, membership application
- Document generation: PDF member cards, Excel reports, HTML labels
- Landing page: real Com.BISS content (no filler text)
- UX audit fixes: AccountNotFound component, shared status badges, confirm dialog,
  pagination, duplicate heading removal, emoji→badge replacement, a11y fixes
- QA: healthcheck fix, API auth fix, enum mismatch fix, password required attribute

packages/features/site-builder/src/context/site-data-context.tsx

@@ -0,0 +1,57 @@
+'use client';
+
+import { createContext, useContext } from 'react';
+
+export interface SiteData {
+  accountId: string;
+  events: Array<{
+    id: string;
+    name: string;
+    event_date: string;
+    event_time?: string;
+    location?: string;
+    fee: number;
+    status: string;
+  }>;
+  courses: Array<{
+    id: string;
+    name: string;
+    start_date?: string;
+    end_date?: string;
+    fee: number;
+    capacity?: number;
+    enrolled_count: number;
+    status?: string;
+  }>;
+  posts: Array<{
+    id: string;
+    title: string;
+    excerpt?: string;
+    cover_image?: string;
+    published_at?: string;
+    slug: string;
+  }>;
+}
+
+const SiteDataContext = createContext<SiteData>({
+  accountId: '',
+  events: [],
+  courses: [],
+  posts: [],
+});
+
+export function SiteDataProvider({
+  data,
+  children,
+}: {
+  data: SiteData;
+  children: React.ReactNode;
+}) {
+  return (
+    <SiteDataContext.Provider value={data}>{children}</SiteDataContext.Provider>
+  );
+}
+
+export function useSiteData() {
+  return useContext(SiteDataContext);
+}