feat: 修复仪表盘数据管线 — 补充应用发布种子数据 + 修复limit参数解析 + LDAP认证集成 + User类型完善

后端改进:
- 修复 dashboard/recent-alerts 的 limit 参数解析 (原代码错误地将数字解析为日期)
- 为 dashboard/recent-releases 添加 limit 参数解析支持
- 新增 generateAppReleases 种子数据生成函数 (10条应用发布记录)
- 修复 AlertEvent 的 rule_name/rule_id/severity 数据一致性
- 添加 go-ldap/ldap/v3 依赖并集成 LDAP 认证处理器
- 添加 seed.go 自动种子数据初始化 (admin用户+LDAP配置)
- User model 添加 AuthSource/LDAPConfig 字段

前端改进:
- 修复 User 类型定义以匹配后端 API (real_name/is_admin/auth_source等)
- 修复 Header.tsx 的 real_name 属性引用导致 TypeScript 编译错误
- 统一 API 服务层、暗色主题样式、组件联调优化

验证:
- go build ./... 编译通过
- npm run build 构建通过
- 仪表盘发布历史、告警消息等区域数据正常展示
- 健康检查 /health 正常

frontend/src/components/server/CloudServerImport.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
@@ -20,7 +20,7 @@ import {
   RefreshCw,
   Check,
 } from 'lucide-react';
-import { cloudAccounts } from '@/mocks/data';
+import { cloudApi } from '@/services/api';
 
 interface CloudServerImportProps {
   open: boolean;
@@ -45,12 +45,26 @@ const mockCloudServers = [
 ];
 
 export function CloudServerImport({ open, onClose }: CloudServerImportProps) {
+  const [cloudAccounts, setCloudAccounts] = useState<any[]>([]);
   const [step, setStep] = useState(1);
   const [selectedProvider, setSelectedProvider] = useState<string>('');
   const [selectedAccount, setSelectedAccount] = useState<string>('');
   const [selectedServers, setSelectedServers] = useState<string[]>([]);
   const [isLoading, setIsLoading] = useState(false);
 
+  const loadAccounts = async () => {
+    try {
+      const res: any = await cloudApi.getAccounts();
+      setCloudAccounts(res?.list || []);
+    } catch (e) {
+      console.error('加载云账号失败:', e);
+    }
+  };
+
+  useEffect(() => {
+    loadAccounts();
+  }, []);
+
   const filteredAccounts = cloudAccounts.filter(
     acc => acc.provider === selectedProvider && acc.status === 'active'
   );
@@ -196,14 +210,14 @@ export function CloudServerImport({ open, onClose }: CloudServerImportProps) {
                         <Key className="h-5 w-5 text-blue-400" />
                         <div>
                           <p className="font-medium text-slate-200">{account.name}</p>
-                          <p className="text-xs text-slate-500">{account.accessKey.slice(0, 20)}...</p>
+                          <p className="text-xs text-slate-500">{(account.access_key || account.accessKey || '').slice(0, 20)}...</p>
                         </div>
                       </div>
                       <div className="text-right">
                         <Badge className="bg-emerald-500/20 text-emerald-400 border-0">
-                          {account.regionCount} 区域
+                          {account.region_count ?? account.regionCount ?? 0} 区域
                         </Badge>
-                        <p className="text-xs text-slate-500 mt-1">{account.serverCount} 服务器</p>
+                        <p className="text-xs text-slate-500 mt-1">{account.server_count ?? account.serverCount ?? 0} 服务器</p>
                       </div>
                     </CardContent>
                   </Card>