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/auth/Login.tsx

@@ -0,0 +1,86 @@
+import { useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { useUserStore } from '@/store';
+import { userApi } from '@/services/api';
+
+export function Login() {
+  const navigate = useNavigate();
+  const login = useUserStore((s) => s.login);
+  const [username, setUsername] = useState('admin');
+  const [password, setPassword] = useState('123456');
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState('');
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError('');
+    setLoading(true);
+    try {
+      const result = await userApi.login(username, password);
+      login(result.user, result.token);
+      navigate('/', { replace: true });
+    } catch (err: any) {
+      setError(err.message || '登录失败');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="min-h-screen bg-slate-950 flex items-center justify-center px-4">
+      <div className="w-full max-w-sm">
+        {/* Logo */}
+        <div className="text-center mb-8">
+          <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-blue-600 mb-4">
+            <svg className="w-8 h-8 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
+              <path strokeLinecap="round" strokeLinejoin="round" d="M9 17v-2a4 4 0 014-4h2m4-2H5a2 2 0 00-2 2v10a2 2 0 002 2h14a2 2 0 002-2V7a2 2 0 00-2-2z M7 7h.01M11 7h.01M15 7h.01" />
+            </svg>
+          </div>
+          <h1 className="text-2xl font-bold text-white">AIOps 智能运维平台</h1>
+          <p className="text-slate-400 mt-2 text-sm">EZOps Platform</p>
+        </div>
+
+        {/* Form */}
+        <form onSubmit={handleSubmit} className="bg-slate-900/60 rounded-xl p-6 space-y-4">
+          {error && (
+            <div className="bg-red-500/10 text-red-400 text-sm rounded-lg px-4 py-3">
+              {error}
+            </div>
+          )}
+          <div>
+            <label className="block text-sm font-medium text-slate-300 mb-1.5">用户名</label>
+            <input
+              type="text"
+              value={username}
+              onChange={(e) => setUsername(e.target.value)}
+              className="w-full bg-slate-800 text-white rounded-lg px-4 py-2.5 border border-slate-700 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500 transition-colors"
+              placeholder="请输入用户名"
+              autoFocus
+            />
+          </div>
+          <div>
+            <label className="block text-sm font-medium text-slate-300 mb-1.5">密码</label>
+            <input
+              type="password"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              className="w-full bg-slate-800 text-white rounded-lg px-4 py-2.5 border border-slate-700 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500 transition-colors"
+              placeholder="请输入密码"
+            />
+          </div>
+          <button
+            type="submit"
+            disabled={loading}
+            className="w-full bg-blue-600 hover:bg-blue-700 disabled:opacity-50 text-white font-medium rounded-lg px-4 py-2.5 transition-colors"
+          >
+            {loading ? '登录中...' : '登录'}
+          </button>
+        </form>
+
+        <p className="text-center text-slate-500 text-xs mt-6">
+          默认账号 admin / 123456
+        </p>
+      </div>
+    </div>
+  );
+}

frontend/src/components/auth/ProtectedRoute.tsx

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+import { Navigate } from 'react-router-dom';
+import { useUserStore } from '@/store';
+
+export function ProtectedRoute({ children }: { children: React.ReactNode }) {
+  const isAuthenticated = useUserStore((s) => s.isAuthenticated);
+  if (!isAuthenticated) {
+    return <Navigate to="/login" replace />;
+  }
+  return <>{children}</>;
+}