checkpoint: pre-refactor state before fixing P0/P1 issues

cloudfunctions/createPost/index.js

@@ -27,6 +27,11 @@ exports.main = async (event, context) => {
       updatedAt: db.serverDate(),
     }
 
+    // geo.near 距离查询字段；无定位时整个字段省略（写 null 会让地理索引构建失败）
+    if (location && typeof location.latitude === 'number' && typeof location.longitude === 'number') {
+      post.geo = db.Geo.Point(location.longitude, location.latitude)
+    }
+
     const res = await db.collection('posts').add({ data: post })
 
     // 更新用户帖子统计