Add sermon retention policy feature

Implemented a configurable retention policy system for sermons with automatic cleanup:
- Added settings table to store retention policy configuration
- Created API endpoints for getting/setting retention policy
- Added Database Settings section to admin page with retention options (forever, 1-10 years)
- Implemented manual cleanup endpoint for on-demand deletion
- Added automated daily cleanup task via Nitro plugin
- Sermons are deleted based on their date field according to the retention policy

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pages/admin.vue

@@ -346,8 +346,68 @@
           </NuxtLink>
         </div>
       </form>
+
+      <!-- Database Settings Section -->
+      <div class="bg-white shadow-lg rounded-lg p-8 mt-8">
+        <h2 class="text-2xl font-bold text-gray-900 mb-6">Database Settings</h2>
+
+        <div class="space-y-4">
+          <div>
+            <label for="retention-policy" class="block text-sm font-medium text-gray-700 mb-2">
+              Sermon Retention Policy
+            </label>
+            <p class="text-sm text-gray-600 mb-3">
+              Choose how long to keep sermons in the database. Older sermons will be automatically deleted based on this policy.
+            </p>
+            <select
+              id="retention-policy"
+              v-model="retentionPolicy"
+              @change="handleRetentionPolicyChange"
+              :disabled="savingRetentionPolicy"
+              class="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500 disabled:opacity-50"
+            >
+              <option value="forever">Keep Forever</option>
+              <option value="1_month">1 Month</option>
+              <option value="3_months">3 Months</option>
+              <option value="6_months">6 Months</option>
+              <option value="1_year">1 Year</option>
+              <option value="3_years">3 Years</option>
+              <option value="5_years">5 Years</option>
+              <option value="10_years">10 Years</option>
+            </select>
+          </div>
+
+          <div v-if="retentionPolicyError" class="text-red-600 text-sm">
+            {{ retentionPolicyError }}
+          </div>
+          <div v-if="retentionPolicySuccess" class="text-green-600 text-sm">
+            {{ retentionPolicySuccess }}
+          </div>
+
+          <div class="border-t pt-4 mt-4">
+            <button
+              @click="handleManualCleanup"
+              :disabled="cleaningUp"
+              class="px-6 py-2 bg-orange-600 text-white rounded-md hover:bg-orange-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-orange-500 disabled:opacity-50 disabled:cursor-not-allowed font-medium"
+            >
+              {{ cleaningUp ? 'Running Cleanup...' : 'Run Cleanup Now' }}
+            </button>
+            <p class="text-xs text-gray-500 mt-2">
+              Manually trigger the cleanup process to delete sermons according to the retention policy.
+              This will also run automatically on a daily schedule.
+            </p>
+          </div>
+
+          <div v-if="cleanupError" class="text-red-600 text-sm">
+            {{ cleanupError }}
+          </div>
+          <div v-if="cleanupSuccess" class="text-green-600 text-sm">
+            {{ cleanupSuccess }}
+          </div>
+        </div>
+      </div>
     </main>
-    
+
     <Footer />
   </div>
 </template>
@@ -384,6 +444,21 @@ const error = ref('')
 const success = ref('')
 const loading = ref(false)
 
+// Database settings state
+const retentionPolicy = ref('forever')
+const savingRetentionPolicy = ref(false)
+const retentionPolicyError = ref('')
+const retentionPolicySuccess = ref('')
+const cleaningUp = ref(false)
+const cleanupError = ref('')
+const cleanupSuccess = ref('')
+
+// Fetch current retention policy
+const { data: retentionPolicyData } = await useFetch('/api/settings/retention-policy')
+if (retentionPolicyData.value) {
+  retentionPolicy.value = retentionPolicyData.value.retentionPolicy
+}
+
 // Check if selected sermon is archived
 const isSelectedSermonArchived = computed(() => {
   if (!selectedSermonId.value || !allSermons.value) return false
@@ -648,4 +723,55 @@ async function handleLogout() {
   await $fetch('/api/auth/logout', { method: 'POST' })
   await navigateTo('/login')
 }
+
+async function handleRetentionPolicyChange() {
+  retentionPolicyError.value = ''
+  retentionPolicySuccess.value = ''
+  savingRetentionPolicy.value = true
+
+  try {
+    await $fetch('/api/settings/retention-policy', {
+      method: 'POST',
+      body: {
+        retentionPolicy: retentionPolicy.value
+      }
+    })
+
+    retentionPolicySuccess.value = 'Retention policy saved successfully!'
+
+    // Clear success message after 3 seconds
+    setTimeout(() => {
+      retentionPolicySuccess.value = ''
+    }, 3000)
+  } catch (e: any) {
+    retentionPolicyError.value = e.data?.message || 'Failed to save retention policy'
+  } finally {
+    savingRetentionPolicy.value = false
+  }
+}
+
+async function handleManualCleanup() {
+  if (!confirm('Are you sure you want to run the cleanup process?\n\nThis will permanently delete all sermons older than the retention policy. This action cannot be undone.')) {
+    return
+  }
+
+  cleanupError.value = ''
+  cleanupSuccess.value = ''
+  cleaningUp.value = true
+
+  try {
+    const result = await $fetch('/api/sermons/cleanup', {
+      method: 'POST'
+    })
+
+    cleanupSuccess.value = result.message + ` (${result.deletedCount} sermon${result.deletedCount !== 1 ? 's' : ''} deleted)`
+
+    // Refresh sermon list after cleanup
+    await refreshSermons()
+  } catch (e: any) {
+    cleanupError.value = e.data?.message || 'Failed to run cleanup'
+  } finally {
+    cleaningUp.value = false
+  }
+}
 </script>