feat(risk-control): add content moderation audit

frontend/src/views/admin/SettingsView.vue

@@ -4264,6 +4264,39 @@
           </div>
         </div>
 
+        <div class="card">
+          <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
+            <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+              {{ t('admin.settings.features.riskControl.title') }}
+            </h2>
+            <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">
+              {{ t('admin.settings.features.riskControl.description') }}
+            </p>
+            <p class="mt-1.5 text-xs">
+              <router-link
+                to="/admin/risk-control"
+                class="inline-flex items-center gap-1 text-primary-600 hover:underline dark:text-primary-400"
+              >
+                {{ t('admin.settings.features.riskControl.configureLink') }}
+                <span aria-hidden="true">→</span>
+              </router-link>
+            </p>
+          </div>
+          <div class="space-y-5 p-6">
+            <div class="flex items-center justify-between">
+              <div>
+                <label class="text-sm font-medium text-gray-700 dark:text-gray-300">
+                  {{ t('admin.settings.features.riskControl.enabled') }}
+                </label>
+                <p class="mt-0.5 text-xs text-gray-500 dark:text-gray-400">
+                  {{ t('admin.settings.features.riskControl.enabledHint') }}
+                </p>
+              </div>
+              <Toggle v-model="form.risk_control_enabled" />
+            </div>
+          </div>
+        </div>
+
         <!-- Affiliate (邀请返利) feature card -->
         <div class="card">
           <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
@@ -5828,6 +5861,7 @@ const form = reactive<SettingsForm>({
   backend_mode_enabled: false,
   hide_ccs_import_button: false,
   payment_enabled: false,
+  risk_control_enabled: false,
   payment_min_amount: 1,
   payment_max_amount: 10000,
   payment_daily_limit: 50000,
@@ -6863,6 +6897,7 @@ async function saveSettings() {
         form.enable_anthropic_cache_ttl_1h_injection,
       // Payment configuration
       payment_enabled: form.payment_enabled,
+      risk_control_enabled: form.risk_control_enabled,
       payment_min_amount: Number(form.payment_min_amount) || 0,
       payment_max_amount: Number(form.payment_max_amount) || 0,
       payment_daily_limit: Number(form.payment_daily_limit) || 0,