Update dependencies to include TinyMCE and Quill, enhance Navigation component with a new Newsletter submenu, and implement role-based access control for CMS features. Refactor user role handling to support multiple roles and improve user management functionality across various API endpoints.

server/api/newsletter/check-subscription.get.js

@@ -0,0 +1,38 @@
+import { readSubscribers } from '../../utils/newsletter.js'
+
+export default defineEventHandler(async (event) => {
+  try {
+    const query = getQuery(event)
+    const { email, groupId } = query
+
+    if (!email || !groupId) {
+      throw createError({
+        statusCode: 400,
+        statusMessage: 'E-Mail und Gruppen-ID sind erforderlich'
+      })
+    }
+
+    const subscribers = await readSubscribers()
+    const emailLower = email.toLowerCase()
+    
+    const subscriber = subscribers.find(s => {
+      const sEmail = (s.email || '').toLowerCase()
+      return sEmail === emailLower && s.groupIds && s.groupIds.includes(groupId) && s.confirmed && !s.unsubscribedAt
+    })
+
+    return {
+      success: true,
+      subscribed: !!subscriber
+    }
+  } catch (error) {
+    console.error('Fehler beim Prüfen der Newsletter-Anmeldung:', error)
+    if (error.statusCode) {
+      throw error
+    }
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Fehler beim Prüfen der Newsletter-Anmeldung'
+    })
+  }
+})
+