Refactor CMS navigation and remove outdated pages

This commit updates the Navigation component to replace links for "Über uns", "Geschichte", "TT-Regeln", "Satzung", and "Termine" with a consolidated "Inhalte" and "Sportbetrieb" section. Additionally, it removes the corresponding pages for "Geschichte", "Mannschaften", "Satzung", "Termine", and "Spielpläne" to streamline the CMS structure and improve content management efficiency.

pages/cms/sportbetrieb.vue

@@ -0,0 +1,58 @@
+<template>
+  <div class="min-h-screen bg-gray-50">
+    <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+      <div class="mb-6">
+        <h1 class="text-3xl font-display font-bold text-gray-900">Sportbetrieb verwalten</h1>
+        <p class="mt-1 text-sm text-gray-500">Termine, Mannschaften und Spielpläne pflegen</p>
+      </div>
+
+      <!-- Tabs -->
+      <div class="border-b border-gray-200 mb-6">
+        <nav class="-mb-px flex space-x-8 overflow-x-auto" aria-label="Tabs">
+          <button
+            v-for="tab in tabs"
+            :key="tab.id"
+            class="whitespace-nowrap py-4 px-1 border-b-2 font-medium text-sm transition-colors"
+            :class="activeTab === tab.id
+              ? 'border-primary-600 text-primary-600'
+              : 'border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300'"
+            @click="activeTab = tab.id"
+          >
+            {{ tab.label }}
+          </button>
+        </nav>
+      </div>
+
+      <!-- Tab Content -->
+      <div>
+        <CmsTermine v-if="activeTab === 'termine'" />
+        <CmsMannschaften v-if="activeTab === 'mannschaften'" />
+        <CmsSpielplaene v-if="activeTab === 'spielplaene'" />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import CmsTermine from '~/components/cms/CmsTermine.vue'
+import CmsMannschaften from '~/components/cms/CmsMannschaften.vue'
+import CmsSpielplaene from '~/components/cms/CmsSpielplaene.vue'
+
+definePageMeta({
+  middleware: 'auth',
+  layout: 'default'
+})
+
+useHead({
+  title: 'Sportbetrieb verwalten – CMS'
+})
+
+const activeTab = ref('termine')
+
+const tabs = [
+  { id: 'termine', label: 'Termine' },
+  { id: 'mannschaften', label: 'Mannschaften' },
+  { id: 'spielplaene', label: 'Spielpläne' }
+]
+</script>