refactor: 标准化项目结构 frontend/ + backend/ + SQLite + run.sh

- 目录重构: app/ -> frontend/，与 backend/ 并列
- 数据库: 默认 SQLite（零配置），修复 DSN() bug
- run.sh: 一键启动前后端，支持 start/stop/restart/status
- Makefile: install/dev/build/lint/clean 快捷命令
- vite.config.ts: 配置 dev server 端口 5173 + API 代理到 8080
- config.yaml: SQLite 默认配置，开箱即用
- docs/: 完整开发文档（项目结构/API/数据库/规范/部署）
- 修复: GORM foreign key 关联声明
- 修复: go get gorm.io/driver/sqlite 依赖

frontend/src/components/cloud/DomainManager.tsx

@@ -0,0 +1,235 @@
+import { useState } from 'react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Badge } from '@/components/ui/badge';
+import { 
+  Plus, 
+  Search, 
+  Edit2, 
+  Trash2, 
+  Globe,
+  CheckCircle2,
+  XCircle,
+  Clock,
+  ExternalLink
+} from 'lucide-react';
+import { domains } from '@/mocks/data';
+
+interface Domain {
+  id: string;
+  name: string;
+  registrar: string;
+  status: 'active' | 'expired' | 'pending';
+  expireDate: string;
+  dnsProvider: string;
+  recordCount: number;
+  sslEnabled: boolean;
+  sslExpireDate?: string;
+}
+
+export function DomainManager() {
+  const [searchQuery, setSearchQuery] = useState('');
+  const [selectedStatus, setSelectedStatus] = useState<string>('all');
+
+  const filteredDomains = domains.filter(domain => {
+    const matchesSearch = domain.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
+                         domain.registrar.toLowerCase().includes(searchQuery.toLowerCase());
+    const matchesStatus = selectedStatus === 'all' || domain.status === selectedStatus;
+    return matchesSearch && matchesStatus;
+  });
+
+  const stats = {
+    total: domains.length,
+    active: domains.filter(d => d.status === 'active').length,
+    expired: domains.filter(d => d.status === 'expired').length,
+    pending: domains.filter(d => d.status === 'pending').length,
+    sslEnabled: domains.filter(d => d.sslEnabled).length,
+  };
+
+  const getDaysUntilExpiry = (expireDate: string) => {
+    const days = Math.ceil((new Date(expireDate).getTime() - Date.now()) / (1000 * 60 * 60 * 24));
+    return days;
+  };
+
+  return (
+    <div className="space-y-6">
+      {/* Header */}
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold text-slate-100">域名管理</h1>
+          <p className="text-slate-400 mt-1">管理域名注册信息和DNS解析记录</p>
+        </div>
+        <Button className="bg-blue-600 hover:bg-blue-700">
+          <Plus className="h-4 w-4 mr-2" />
+          添加域名
+        </Button>
+      </div>
+
+      {/* Stats */}
+      <div className="grid grid-cols-5 gap-4">
+        <Card className="bg-slate-800 border-slate-700">
+          <CardContent className="p-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <p className="text-slate-400 text-sm">域名总数</p>
+                <p className="text-2xl font-bold text-slate-100 mt-1">{stats.total}</p>
+              </div>
+              <div className="w-10 h-10 rounded-lg bg-blue-500/20 flex items-center justify-center">
+                <Globe className="h-5 w-5 text-blue-400" />
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+        <Card className="bg-slate-800 border-slate-700">
+          <CardContent className="p-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <p className="text-slate-400 text-sm">正常</p>
+                <p className="text-2xl font-bold text-green-400 mt-1">{stats.active}</p>
+              </div>
+              <div className="w-10 h-10 rounded-lg bg-green-500/20 flex items-center justify-center">
+                <CheckCircle2 className="h-5 w-5 text-green-400" />
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+        <Card className="bg-slate-800 border-slate-700">
+          <CardContent className="p-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <p className="text-slate-400 text-sm">已过期</p>
+                <p className="text-2xl font-bold text-red-400 mt-1">{stats.expired}</p>
+              </div>
+              <div className="w-10 h-10 rounded-lg bg-red-500/20 flex items-center justify-center">
+                <XCircle className="h-5 w-5 text-red-400" />
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+        <Card className="bg-slate-800 border-slate-700">
+          <CardContent className="p-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <p className="text-slate-400 text-sm">待审核</p>
+                <p className="text-2xl font-bold text-yellow-400 mt-1">{stats.pending}</p>
+              </div>
+              <div className="w-10 h-10 rounded-lg bg-yellow-500/20 flex items-center justify-center">
+                <Clock className="h-5 w-5 text-yellow-400" />
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+        <Card className="bg-slate-800 border-slate-700">
+          <CardContent className="p-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <p className="text-slate-400 text-sm">SSL证书</p>
+                <p className="text-2xl font-bold text-cyan-400 mt-1">{stats.sslEnabled}</p>
+              </div>
+              <div className="w-10 h-10 rounded-lg bg-cyan-500/20 flex items-center justify-center">
+                <CheckCircle2 className="h-5 w-5 text-cyan-400" />
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+      </div>
+
+      {/* Filters */}
+      <div className="flex items-center gap-4">
+        <div className="relative flex-1 max-w-md">
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-slate-400" />
+          <Input
+            placeholder="搜索域名..."
+            value={searchQuery}
+            onChange={(e) => setSearchQuery(e.target.value)}
+            className="pl-10 bg-slate-800 border-slate-700 text-slate-100"
+          />
+        </div>
+        <select
+          value={selectedStatus}
+          onChange={(e) => setSelectedStatus(e.target.value)}
+          className="px-3 py-2 bg-slate-800 border border-slate-700 rounded-md text-slate-100 text-sm"
+        >
+          <option value="all">全部状态</option>
+          <option value="active">正常</option>
+          <option value="expired">已过期</option>
+          <option value="pending">待审核</option>
+        </select>
+      </div>
+
+      {/* Domain List */}
+      <div className="space-y-3">
+        {filteredDomains.map((domain) => {
+          const daysUntilExpiry = getDaysUntilExpiry(domain.expireDate);
+          return (
+            <Card key={domain.id} className="bg-slate-800 border-slate-700">
+              <CardContent className="p-4">
+                <div className="flex items-center justify-between">
+                  <div className="flex items-center gap-4">
+                    <div className="w-10 h-10 rounded-lg bg-gradient-to-br from-blue-500 to-cyan-500 flex items-center justify-center">
+                      <Globe className="h-5 w-5 text-white" />
+                    </div>
+                    <div>
+                      <div className="flex items-center gap-2">
+                        <h3 className="font-medium text-slate-100 text-lg">{domain.name}</h3>
+                        {domain.status === 'active' && (
+                          <Badge className="bg-green-500/20 text-green-400 border-0">
+                            <CheckCircle2 className="h-3 w-3 mr-1" />
+                            正常
+                          </Badge>
+                        )}
+                        {domain.status === 'expired' && (
+                          <Badge className="bg-red-500/20 text-red-400 border-0">
+                            <XCircle className="h-3 w-3 mr-1" />
+                            已过期
+                          </Badge>
+                        )}
+                        {domain.status === 'pending' && (
+                          <Badge className="bg-yellow-500/20 text-yellow-400 border-0">
+                            <Clock className="h-3 w-3 mr-1" />
+                            待审核
+                          </Badge>
+                        )}
+                        {domain.sslEnabled && (
+                          <Badge className="bg-cyan-500/20 text-cyan-400 border-0">
+                            <CheckCircle2 className="h-3 w-3 mr-1" />
+                            SSL
+                          </Badge>
+                        )}
+                      </div>
+                      <div className="flex items-center gap-4 mt-1 text-sm text-slate-400">
+                        <span>注册商: {domain.registrar}</span>
+                        <span>DNS: {domain.dnsProvider}</span>
+                        <span>解析记录: {domain.recordCount}条</span>
+                      </div>
+                    </div>
+                  </div>
+                  <div className="flex items-center gap-4">
+                    <div className="text-right">
+                      <p className="text-sm text-slate-400">到期时间</p>
+                      <p className={`text-sm font-medium ${daysUntilExpiry < 30 ? 'text-red-400' : 'text-slate-200'}`}>
+                        {domain.expireDate} ({daysUntilExpiry}天)
+                      </p>
+                    </div>
+                    <div className="flex items-center gap-1">
+                      <Button variant="ghost" size="icon" className="h-8 w-8 text-slate-400 hover:text-blue-400">
+                        <ExternalLink className="h-4 w-4" />
+                      </Button>
+                      <Button variant="ghost" size="icon" className="h-8 w-8 text-slate-400 hover:text-blue-400">
+                        <Edit2 className="h-4 w-4" />
+                      </Button>
+                      <Button variant="ghost" size="icon" className="h-8 w-8 text-slate-400 hover:text-red-400">
+                        <Trash2 className="h-4 w-4" />
+                      </Button>
+                    </div>
+                  </div>
+                </div>
+              </CardContent>
+            </Card>
+          );
+        })}
+      </div>
+    </div>
+  );
+}