fix: 修复评论/资料/导航胶囊/宠物档案/定位等多处问题，补全相关云函数

- 新增 addComment/getComments/getFollowList/followUser/getUser/updateProfile/updatePet/deletePet 云函数并完成部署
- 统一通过 app.globalData.navBarInfo 避让系统胶囊按钮（编辑资料/编辑宠物等页面保存按钮被遮挡问题）
- 编辑资料页所在城市改为省份 picker 选择
- 修复"我的"页动态为空（getUserPosts 应传 openid 而非数据库 _id）
- 重构编辑宠物页：品种改用 picker 滚轮（替代有数量上限的 actionSheet），标签改用 selectedTagSet 映射 + 自定义标签输入（5字以内、仅中英文/数字、最多8个）
- 接通宠物保存/删除真实云函数调用并同步本地缓存
- 移除 feed 页对不存在的 getStories 云函数调用，修复模拟器卡死
- 移除 post 页对不存在的 wx.reverseGeocoder API 的调用
- 统一扩展 AppGlobalData 类型并修正所有 getApp 调用的泛型，解决 TS 报错

miniprogram/pages/pet-edit/pet-edit.wxss

@@ -26,10 +26,19 @@
 .gender-btn { background: rgba(255,255,255,0.80); border: 1rpx solid rgba(43,37,61,0.12); border-radius: 999rpx; padding: 12rpx 24rpx; font-size: 26rpx; color: #9b8fa8; font-weight: 700; }
 .g-active { background: #ffe5f0; border-color: #ffb6d0; color: #a91d5b; }
 
+.placeholder-text { color: #c4b8d0; }
+
 .tags-section { margin-bottom: 28rpx; }
-.tags-title { display: block; font-size: 26rpx; font-weight: 900; color: #9b8fa8; margin-bottom: 16rpx; }
-.tag-grid { display: flex; gap: 14rpx; flex-wrap: wrap; }
+.tags-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16rpx; }
+.tags-title { font-size: 26rpx; font-weight: 900; color: #9b8fa8; }
+.tags-count { font-size: 22rpx; color: #c4b8d0; }
+.tag-grid { display: flex; gap: 14rpx; flex-wrap: wrap; margin-bottom: 20rpx; }
 .tag-chip { background: rgba(255,255,255,0.80); border: 1rpx solid rgba(43,37,61,0.10); border-radius: 999rpx; padding: 12rpx 24rpx; font-size: 26rpx; color: #6a6178; font-weight: 700; }
 .tag-on { background: #f0e8ff; border-color: #d4b8ff; color: #8c5cff; }
 
+.custom-tag-row { display: flex; gap: 14rpx; align-items: center; margin-top: 4rpx; }
+.custom-tag-input { flex: 1; height: 68rpx; background: rgba(255,255,255,0.80); border: 1rpx solid rgba(43,37,61,0.10); border-radius: 999rpx; padding: 0 24rpx; font-size: 26rpx; color: #272235; }
+.custom-tag-add { background: linear-gradient(135deg, #ff4f91, #ff9f1c); color: #fff; border-radius: 999rpx; padding: 14rpx 30rpx; font-size: 26rpx; font-weight: 800; flex-shrink: 0; }
+.add-disabled { background: #e8e4f0; color: #9b8fa8; }
+
 .delete-btn { text-align: center; font-size: 28rpx; color: #ff4f91; background: rgba(255,79,145,0.08); border-radius: 999rpx; padding: 24rpx; margin-top: 40rpx; }