feat: 實作 Multi-tenancy 多租戶架構 (stancl/tenancy)

- 安裝並設定 stancl/tenancy 套件
- 分離 Central / Tenant migrations
- 建立 Tenant Model 與資料遷移指令
- 建立房東後台 CRUD (Landlord Dashboard)
- 新增租戶管理頁面 (列表、新增、編輯、詳情)
- 新增域名管理功能
- 更新部署手冊

resources/js/Pages/Landlord/Tenant/Edit.tsx

@@ -0,0 +1,107 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { useForm, Link } from "@inertiajs/react";
+import { FormEvent } from "react";
+
+interface Tenant {
+    id: string;
+    name: string;
+    email: string | null;
+    is_active: boolean;
+}
+
+interface Props {
+    tenant: Tenant;
+}
+
+export default function TenantEdit({ tenant }: Props) {
+    const { data, setData, put, processing, errors } = useForm({
+        name: tenant.name,
+        email: tenant.email || "",
+        is_active: tenant.is_active,
+    });
+
+    const handleSubmit = (e: FormEvent) => {
+        e.preventDefault();
+        put(route("landlord.tenants.update", tenant.id));
+    };
+
+    return (
+        <LandlordLayout title="編輯租戶">
+            <div className="max-w-2xl">
+                <div className="mb-6">
+                    <h1 className="text-2xl font-bold text-slate-900">編輯租戶</h1>
+                    <p className="text-slate-500 mt-1">修改租戶 {tenant.id} 的資訊</p>
+                </div>
+
+                <form onSubmit={handleSubmit} className="bg-white rounded-xl border border-slate-200 p-6 space-y-6">
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶 ID
+                        </label>
+                        <input
+                            type="text"
+                            value={tenant.id}
+                            disabled
+                            className="w-full px-4 py-2 border border-slate-200 rounded-lg bg-slate-50 text-slate-500"
+                        />
+                        <p className="mt-1 text-sm text-slate-500">租戶 ID 無法修改</p>
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶名稱 <span className="text-red-500">*</span>
+                        </label>
+                        <input
+                            type="text"
+                            value={data.name}
+                            onChange={(e) => setData("name", e.target.value)}
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.name && <p className="mt-1 text-sm text-red-500">{errors.name}</p>}
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            聯絡信箱
+                        </label>
+                        <input
+                            type="email"
+                            value={data.email}
+                            onChange={(e) => setData("email", e.target.value)}
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.email && <p className="mt-1 text-sm text-red-500">{errors.email}</p>}
+                    </div>
+
+                    <div>
+                        <label className="flex items-center gap-2">
+                            <input
+                                type="checkbox"
+                                checked={data.is_active}
+                                onChange={(e) => setData("is_active", e.target.checked)}
+                                className="w-4 h-4 rounded border-slate-300 text-primary-main focus:ring-primary-main"
+                            />
+                            <span className="text-sm font-medium text-slate-700">啟用此租戶</span>
+                        </label>
+                    </div>
+
+                    <div className="flex items-center gap-4 pt-4 border-t">
+                        <button
+                            type="submit"
+                            disabled={processing}
+                            className="bg-primary-main hover:bg-primary-dark text-white px-6 py-2 rounded-lg disabled:opacity-50 transition-colors"
+                        >
+                            {processing ? "儲存中..." : "儲存變更"}
+                        </button>
+                        <Link
+                            href="/landlord/tenants"
+                            className="text-slate-600 hover:text-slate-900"
+                        >
+                            取消
+                        </Link>
+                    </div>
+                </form>
+            </div>
+        </LandlordLayout>
+    );
+}