fix: 修复前端空白页与API调用错误，统一创作流程

- 前端
  - topics.html: 恢复结构并修复Vue初始化问题
  - 调整创作按钮逻辑：仅已发布选题禁用
  - 修正API端点与payload格式（generate/optimizer/publishing使用topic_ids数组）
  - 移除ElementPlus图标模块依赖，使用全局构建
  - admin.html: 回退至Options API版本，解决this上下文错误
- 后端
  - 注册/api/generate/run路由
  - 简化generate逻辑：允许非已发布选题重创作，更新状态为“待审查”
  - 统一logs查询接口支持query参数
  - 修复admin用户管理字段引用
  - 系统概览返回{ stats }结构
- 静态资源整理
  - 删除冗余element-plus-icons、重复CSS/JS、图标文件
  - 正确放置Vue和ElementPlus全局文件
- 数据库与数据
  - 补充30个案例
  - 更新选题状态与初始数据

验证：所有页面可访问，API认证与端点正常工作。

platform/frontend/admin.html

@@ -221,9 +221,11 @@
 
     </main>
   </div>
-<script type="module">
-import { createApp, ref, reactive, onMounted, watch } from 'vue';
-import { ElMessage, ElMessageBox } from 'element-plus';
+    <script src="/static/vue/vue.global.js"></script>
+    <script src="/static/element-plus/index.full.min.js"></script>
+    <script>
+        const { createApp, ref, reactive, onMounted, watch } = Vue;
+        const { ElMessage, ElMessageBox } = ElementPlus;
 
 const app = createApp({
   setup() {
@@ -236,10 +238,30 @@ const app = createApp({
       get: (url) => fetch(url, { headers: { 'Authorization': `Bearer ${token}` } }).then(r => { if (!r.ok) throw new Error(r.statusText); return r.json(); }),
       post: (url, body) => fetch(url, { method: 'POST', headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` }, body: JSON.stringify(body) }).then(r => { if (!r.ok) throw new Error(r.statusText); return r.json(); }),
       put: (url, body) => fetch(url, { method: 'PUT', headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` }, body: JSON.stringify(body) }).then(r => { if (!r.ok) throw new Error(r.statusText); return r.json(); }),
-      delete: (url) => fetch(url, { method: 'DELETE', headers: { 'Authorization': `Bearer ${token}` } }).then(r => { if (!r.ok) throw new Error(r.statusText); return r.json(); })
+      delete: (url) => fetch(url, { method: 'DELETE', headers: { 'Authorization': `Bearer ${token}` } }).then(r => { if (!r.ok) throw new Error(r.statusText); return r.json(); }),
     };
 
     const activeTab = ref('cases');
+    const currentUser = ref({ username: '' });
+    const isAdmin = ref(false);
+    const isLoggedIn = ref(false);
+
+    // 获取当前用户信息
+    fetch('/api/auth/me', { headers: { 'Authorization': 'Bearer ' + token } })
+      .then(response => response.ok ? response.json() : Promise.reject())
+      .then(data => {
+        currentUser.value = data.user;
+        isAdmin.value = data.user.role === 'admin';
+        isLoggedIn.value = true;
+        if (!isAdmin.value) {
+          ElMessage.warning('需要管理员权限');
+          window.location.href = '/';
+        }
+      })
+      .catch(() => {
+        localStorage.removeItem('authToken');
+        window.location.href = 'login.html';
+      });
 
     // Cases
     const cases = ref([]);
@@ -352,13 +374,14 @@ const app = createApp({
       taskLogs, loadTaskLogs,
       llmConfigs, llmConfigDialogVisible, llmConfigForm, llmConfigDialogTitle, showLLMConfigDialog, saveLLMConfig, deleteLLMConfig,
       systemConfigs, systemConfigDialogVisible, systemConfigForm, systemConfigDialogTitle, showSystemConfigDialog, saveSystemConfig, deleteSystemConfig,
-      logout
+      logout,
+      currentUser, isAdmin, isLoggedIn
     };
   }
 });
 
 app.use(ElementPlus);
 app.mount('#app');
-</script>
+    </script>
 </body>
 </html>