fix(admin-web): 修复通知表单类型错误

为 priority 和 targetType 添加正确的类型断言

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/admin-web/src/app/(dashboard)/notifications/page.tsx

@@ -9,6 +9,8 @@ import {
   notificationService,
   NotificationItem,
   NotificationType,
+  NotificationPriority,
+  TargetType,
   NOTIFICATION_TYPE_OPTIONS,
   NOTIFICATION_PRIORITY_OPTIONS,
   TARGET_TYPE_OPTIONS,
@@ -58,8 +60,8 @@ export default function NotificationsPage() {
     title: '',
     content: '',
     type: 'SYSTEM' as NotificationType,
-    priority: 'NORMAL',
-    targetType: 'ALL',
+    priority: 'NORMAL' as NotificationPriority,
+    targetType: 'ALL' as TargetType,
     imageUrl: '',
     linkUrl: '',
     publishedAt: '',
@@ -363,7 +365,7 @@ export default function NotificationsPage() {
                 <label>优先级</label>
                 <select
                   value={formData.priority}
-                  onChange={(e) => setFormData({ ...formData, priority: e.target.value })}
+                  onChange={(e) => setFormData({ ...formData, priority: e.target.value as NotificationPriority })}
                 >
                   {NOTIFICATION_PRIORITY_OPTIONS.map((opt) => (
                     <option key={opt.value} value={opt.value}>
@@ -377,7 +379,7 @@ export default function NotificationsPage() {
                 <label>目标用户</label>
                 <select
                   value={formData.targetType}
-                  onChange={(e) => setFormData({ ...formData, targetType: e.target.value })}
+                  onChange={(e) => setFormData({ ...formData, targetType: e.target.value as TargetType })}
                 >
                   {TARGET_TYPE_OPTIONS.map((opt) => (
                     <option key={opt.value} value={opt.value}>