feat: rebuild pet app and backend around core care flows

pets-fe/pages/meetup-edit/meetup-edit.wxml

@@ -0,0 +1,53 @@
+<view class="screen">
+  <view class="eyebrow">HOST A WALK</view>
+  <view class="title">发起约遛 🌿</view>
+  <view class="field">
+    <view class="field-label">活动名称</view>
+    <input
+      placeholder="周末一起逛公园"
+      value="{{title}}"
+      data-key="title"
+      bindinput="field"
+    />
+  </view>
+  <view class="field">
+    <view class="field-label">时间</view>
+    <view class="row">
+      <picker mode="date" bindchange="date">
+        <view class="picker">{{date||'选择日期'}}</view>
+      </picker>
+      <picker mode="time" bindchange="time">
+        <view class="picker">{{time||'选择时间'}}</view>
+      </picker>
+    </view>
+  </view>
+  <view class="field">
+    <view class="field-label">集合地点</view>
+    <view class="picker" bindtap="location">
+      📍 {{place_name||'选择地图位置'}}
+    </view>
+  </view>
+  <view class="field">
+    <view class="field-label">人数上限</view>
+    <input
+      type="number"
+      value="{{max_people}}"
+      data-key="max_people"
+      bindinput="field"
+    />
+  </view>
+  <view class="field">
+    <view class="field-label">介绍一下</view>
+    <textarea
+      placeholder="聊聊这次约遛安排"
+      value="{{description}}"
+      data-key="description"
+      bindinput="field"
+    />
+  </view>
+  <view class="field">
+    <view class="field-label">带哪些狗狗？可以多选</view>
+    <pet-picker pets="{{pets}}" selected="{{selected}}" bind:change="pick" />
+  </view>
+  <button class="primary" bindtap="save">发布约遛 →</button>
+</view>