feat: 记录删除与筛选、用户侧内容删除、AI 聊天历史

修复雪花 ID 精度丢失（真 bug）
- bottom-sheet 的 postId 声明为 Number，而 ID 是 18 位雪花字符串，
  超出 JS 安全整数范围：339346584095428608 会被转成 ...600，
  评论弹层实际查的是不存在的帖子。改为 String

记录
- 后端 DELETE /records/:id 早已就绪但前端从未调用，记错了删不掉。
  时间轴支持长按删除
- 时间轴加类型筛选（体重/便便/饮食/异常/用药/疫苗/消费/照片），
  后端 ?type= 本就支持

用户侧内容删除（UGC 合规：用户应能删除自己发布的内容）
- 新增 DELETE /posts/:id 与 DELETE /comments/:id，仅限本人，
  越权返回 40300；帖子软删除，评论删除同步递减 comment_count
- 评论列表返回 is_self；社区长按自己的帖子、长按自己的评论可删

AI 聊天历史
- ai_messages 一直在写但没有查询接口，每次打开弹层都是空白。
  新增 GET /api/ai/messages，弹层打开时接在开场白后加载

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-fe/pages/community/community.js

@@ -32,7 +32,7 @@ Page({
     posts: [],
     sheetShow: false,
     sheetType: '',
-    sheetPostId: 0,
+    sheetPostId: '',
   },
   onLoad() {
     this._unsub = store.subscribe((pet) => this.setData({ pet }));
@@ -77,7 +77,7 @@ Page({
     this.setData({ sheetPostId: e.currentTarget.dataset.id, sheetType: 'comments', sheetShow: true });
   },
   openSheet(e) {
-    this.setData({ sheetType: e.currentTarget.dataset.type, sheetPostId: 0, sheetShow: true });
+    this.setData({ sheetType: e.currentTarget.dataset.type, sheetPostId: '', sheetShow: true });
   },
   closeSheet() {
     this.setData({ sheetShow: false });
@@ -93,7 +93,23 @@ Page({
     wx.navigateTo({ url: '/pages/learn/learn' });
   },
   onFab() {
-    this.setData({ sheetType: 'ai', sheetPostId: 0, sheetShow: true });
+    this.setData({ sheetType: 'ai', sheetPostId: '', sheetShow: true });
+  },
+  // 长按自己的帖子可删除
+  onLongPressPost(e) {
+    const p = this.data.posts[e.currentTarget.dataset.index];
+    if (!p || !p.is_self) return;
+    wx.showModal({
+      title: '删除帖子',
+      content: '确定删除这条帖子？删除后其他人将看不到。',
+      confirmColor: '#D9534F',
+      success: (res) => {
+        if (!res.confirm) return;
+        api.deletePost(p.id)
+          .then(() => { wx.showToast({ title: '已删除', icon: 'success' }); this.loadPosts(); })
+          .catch((err) => wx.showToast({ title: err.message || '删除失败', icon: 'none' }));
+      },
+    });
   },
   // 关注 / 取关帖子作者
   toggleFollow(e) {

pets-fe/pages/community/community.wxml

@@ -19,7 +19,7 @@ module.exports.isUrl = function (s) { return s && s.indexOf('http') === 0; }
     <button class="btn btn-primary btn-block" bindtap="openSheet" data-type="createPost">＋ 发布图文</button>
   </view>
 
-  <view wx:for="{{posts}}" wx:key="id" class="post-card">
+  <view wx:for="{{posts}}" wx:key="id" class="post-card" bindlongpress="onLongPressPost" data-index="{{index}}">
     <view class="post-head">
       <view class="post-avatar">{{item.author_emoji}}</view>
       <view class="post-user"><text class="pu-b">{{item.author_name}}<text wx:if="{{item.is_ai}}" class="ai-tag">AI</text></text><text class="pu-s">宠友</text></view>

pets-fe/pages/record/record.js

@@ -16,6 +16,7 @@ function fmtTime(iso) {
 }
 function mapRecord(r) {
   return {
+    id: r.id,
     icon: r.icon || '✍️',
     title: r.title,
     desc: fmtTime(r.occurred_at) + (r.description ? '｜' + r.description : ''),
@@ -23,6 +24,19 @@ function mapRecord(r) {
   };
 }
 
+// 时间轴类型筛选
+const REC_FILTERS = [
+  { key: '', label: '全部' },
+  { key: 'weight', label: '体重' },
+  { key: 'poop', label: '便便' },
+  { key: 'food', label: '饮食' },
+  { key: 'symptom', label: '异常' },
+  { key: 'medicine', label: '用药' },
+  { key: 'vaccine', label: '疫苗' },
+  { key: 'cost', label: '消费' },
+  { key: 'photo', label: '照片' },
+];
+
 function fmtDay(iso) {
   if (!iso) return '';
   const d = new Date(iso);
@@ -63,6 +77,8 @@ Page({
     recPage: 1,
     recTotal: 0,
     recHasMore: false,
+    recFilters: REC_FILTERS,
+    recFilterIdx: 0,
     trendSvg: '',
     trendStats: null,
     trendDots: [],
@@ -92,11 +108,39 @@ Page({
       })
       .catch((e) => wx.showToast({ title: e.message || '加载失败', icon: 'none' }));
   },
+  curFilter() {
+    return this.data.recFilters[this.data.recFilterIdx].key;
+  },
+  onFilterTap(e) {
+    const i = Number(e.currentTarget.dataset.index);
+    if (i === this.data.recFilterIdx) return;
+    this.setData({ recFilterIdx: i }, () => this.loadRecords());
+  },
+  // 长按删除一条记录
+  onDeleteRecord(e) {
+    const r = this.data.timeline[e.currentTarget.dataset.index];
+    if (!r || !r.id) return;
+    wx.showModal({
+      title: '删除记录',
+      content: '确定删除「' + r.title + '」？删除后不可恢复。',
+      confirmColor: '#D9534F',
+      success: (res) => {
+        if (!res.confirm) return;
+        api
+          .deleteRecord(r.id)
+          .then(() => {
+            wx.showToast({ title: '已删除', icon: 'success' });
+            this.loadRecords();
+          })
+          .catch((err) => wx.showToast({ title: err.message || '删除失败', icon: 'none' }));
+      },
+    });
+  },
   loadRecords() {
     const id = store.currentPetId();
     if (!id) return;
     api
-      .getRecords(id, { page: 1, pageSize: REC_PAGE })
+      .getRecords(id, { page: 1, pageSize: REC_PAGE, type: this.curFilter() })
       .then((res) => {
         const list = (res.list || []).map(mapRecord);
         this.setData({ timeline: list, recPage: 1, recTotal: res.total || 0, recHasMore: list.length < (res.total || 0) });
@@ -109,7 +153,7 @@ Page({
     if (!id) return;
     const next = this.data.recPage + 1;
     api
-      .getRecords(id, { page: next, pageSize: REC_PAGE })
+      .getRecords(id, { page: next, pageSize: REC_PAGE, type: this.curFilter() })
       .then((res) => {
         const merged = this.data.timeline.concat((res.list || []).map(mapRecord));
         this.setData({ timeline: merged, recPage: next, recTotal: res.total || 0, recHasMore: merged.length < (res.total || 0) });

pets-fe/pages/record/record.wxml

@@ -50,16 +50,24 @@
 
   <view class="card">
     <view class="section-head"><view class="sh-title">健康时间轴</view><view class="link" data-type="vetSummary" bindtap="openSheet">摘要</view></view>
+    <scroll-view class="rec-filter" scroll-x="true" enhanced="{{true}}" show-scrollbar="{{false}}">
+      <view wx:for="{{recFilters}}" wx:key="key"
+            class="rf-chip {{recFilterIdx === index ? 'on' : ''}}"
+            data-index="{{index}}" bindtap="onFilterTap">{{item.label}}</view>
+    </scroll-view>
+
     <view class="health-timeline">
-      <view wx:for="{{timeline}}" wx:key="index" class="health-event">
+      <view wx:for="{{timeline}}" wx:key="id" class="health-event"
+            bindlongpress="onDeleteRecord" data-index="{{index}}">
         <view class="event-dot">{{item.icon}}</view>
         <view class="he-body">
           <text class="he-b">{{item.title}}</text><view class="he-p">{{item.desc}}</view>
-          <image wx:if="{{item.image}}" class="he-img" src="{{item.image}}" mode="aspectFill" bindtap="previewImage" data-src="{{item.image}}"></image>
+          <image wx:if="{{item.image}}" class="he-img" src="{{item.image}}" mode="aspectFill" catchtap="previewImage" data-src="{{item.image}}"></image>
         </view>
       </view>
-      <view wx:if="{{timeline.length === 0}}" class="tl-empty">还没有记录，用上面的按钮记一条吧</view>
+      <view wx:if="{{timeline.length === 0}}" class="tl-empty">这个分类下还没有记录</view>
     </view>
+    <view wx:if="{{timeline.length}}" class="tl-tip">长按任意一条可删除</view>
     <view wx:if="{{recHasMore}}" class="tl-more" bindtap="loadMoreRecords">查看更多（共 {{recTotal}} 条）</view>
     <view wx:elif="{{recPage > 1}}" class="tl-more" bindtap="collapseRecords">收起</view>
   </view>

pets-fe/pages/record/record.wxss

@@ -50,3 +50,12 @@
 /* 页面不自身滚动，改由 page-scroll 承载滚动（隐藏滚动条）*/
 page{height:100vh;overflow:hidden;display:flex;flex-direction:column}
 .page-scroll{flex:1;min-height:0}
+
+/* 时间轴类型筛选 */
+.rec-filter{white-space:nowrap;margin-bottom:20rpx}
+.rf-chip{
+  display:inline-block;padding:10rpx 26rpx;margin-right:14rpx;border-radius:999rpx;
+  background:#fff;border:1rpx solid var(--line);color:var(--muted);font-size:24rpx;font-weight:700;
+}
+.rf-chip.on{background:#FFF2DC;color:var(--primary-dark);border-color:#FFD39A}
+.tl-tip{margin-top:16rpx;text-align:center;color:var(--muted);font-size:22rpx}