feat: 添加租后须知功能并优化发布默认设置

新增功能：
- 添加租后须知查看功能（PC端+移动端）
- 管理后台支持配置租后须知内容
- 默认提供完整的租后须知模板

功能实现：
- 后端：新增 PostRentalNotice API 接口和配置管理
- PC端：在用户下拉菜单添加租后须知入口，独立页面展示
- 移动端：在个人中心实名认证下方添加入口，弹窗展示
- 管理端：新增租后须知配置弹窗，支持编辑和恢复默认

优化改进：
- 修复发布页面默认选中"参考比例"而非"自定比例"
- 移除错误的迁移测试脚本（与 MySQL 8.0 不兼容）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/features/admin/views/AdminSystemConfigsView.vue

@@ -27,6 +27,7 @@ import SalePriceDialog from '../components/SalePriceDialog.vue'
 import HomeAnnouncementsDialog from '../components/HomeAnnouncementsDialog.vue'
 import HomeBannersDialog from '../components/HomeBannersDialog.vue'
 import OrderAgreementsDialog from '../components/OrderAgreementsDialog.vue'
+import PostRentalNoticeDialog from '../components/PostRentalNoticeDialog.vue'
 import GeneralConfigDialog from '../components/GeneralConfigDialog.vue'
 import AutoWelcomeConfig from '../components/AutoWelcomeConfig.vue'
 
@@ -51,6 +52,7 @@ const salePriceVisible = ref(false)
 const announcementsVisible = ref(false)
 const bannersVisible = ref(false)
 const agreementsVisible = ref(false)
+const postRentalNoticeVisible = ref(false)
 const generalVisible = ref(false)
 
 const publishConfig = computed(() => configs.value.find((item) => item.key === 'listing.publish_options') || null)
@@ -58,6 +60,7 @@ const salePriceConfig = computed(() => configs.value.find((item) => item.key ===
 const homeAnnouncementsConfig = computed(() => configs.value.find((item) => item.key === 'mobile.home_announcements') || null)
 const homeBannersConfig = computed(() => configs.value.find((item) => item.key === 'mobile.home_banners') || null)
 const orderAgreementsConfig = computed(() => configs.value.find((item) => item.key === 'order.agreements') || null)
+const postRentalNoticeConfig = computed(() => configs.value.find((item) => item.key === 'profile.post_rental_notice') || null)
 
 const regularConfigs = computed(() =>
   configs.value.filter(
@@ -66,7 +69,8 @@ const regularConfigs = computed(() =>
       item.key !== 'listing.sale_price_config' &&
       item.key !== 'mobile.home_announcements' &&
       item.key !== 'mobile.home_banners' &&
-      item.key !== 'order.agreements',
+      item.key !== 'order.agreements' &&
+      item.key !== 'profile.post_rental_notice',
   ),
 )
 
@@ -136,6 +140,8 @@ function openEdit(row: SystemConfig) {
     bannersVisible.value = true
   } else if (row.key === 'order.agreements') {
     agreementsVisible.value = true
+  } else if (row.key === 'profile.post_rental_notice') {
+    postRentalNoticeVisible.value = true
   } else {
     generalVisible.value = true
   }
@@ -356,6 +362,39 @@ function formatConfigValue(row: SystemConfig) {
       </div>
     </section>
 
+    <section v-if="postRentalNoticeConfig" class="publish-config-panel">
+      <div class="publish-config-main">
+        <div>
+          <p class="eyebrow">Post Rental Notice</p>
+          <h2>租后须知配置</h2>
+          <span>管理移动端个人中心展示的租后须知内容，用户在实名认证下方可查看。</span>
+        </div>
+        <el-button type="primary" @click="openEdit(postRentalNoticeConfig)">编辑租后须知</el-button>
+      </div>
+      <div class="publish-stat-grid home-stat-grid">
+        <div class="publish-stat">
+          <strong>1</strong>
+          <span>须知文档</span>
+        </div>
+        <div class="publish-stat">
+          <strong>移动端</strong>
+          <span>个人中心展示</span>
+        </div>
+        <div class="publish-stat">
+          <strong>实名认证</strong>
+          <span>下方位置</span>
+        </div>
+        <div class="publish-stat">
+          <strong>接口</strong>
+          <span>/api/post-rental-notice</span>
+        </div>
+        <div class="publish-stat">
+          <strong>更新</strong>
+          <span>{{ formatHomeConfigStatus(postRentalNoticeConfig, '未初始化') }}</span>
+        </div>
+      </div>
+    </section>
+
     <AutoWelcomeConfig />
 
     <el-table v-loading="loading" class="table-panel" :data="regularConfigs">
@@ -414,6 +453,13 @@ function formatConfigValue(row: SystemConfig) {
       @saved="loadConfigs"
     />
 
+    <PostRentalNoticeDialog
+      v-if="postRentalNoticeConfig"
+      v-model="postRentalNoticeVisible"
+      :config="postRentalNoticeConfig"
+      @saved="loadConfigs"
+    />
+
     <GeneralConfigDialog
       v-if="currentEditingConfig"
       v-model="generalVisible"