修复动态发布与互动问题

cloudfunctions/login/index.js

@@ -9,11 +9,16 @@ function makeHandle(openid) {
   return `@user_${suffix}`
 }
 
-// Default avatar pool to randomise new user avatars
-const AVATAR_KEYS = [
-  'gradient-avatar-1', 'gradient-avatar-2', 'gradient-avatar-3',
-  'gradient-avatar-4', 'gradient-avatar-5', 'gradient-avatar-6'
-]
+// Deterministic gradient swatch (.gradient-avatar-1..6) from the user's openid, so
+// a user who hasn't set a real avatar always gets the same stable colour.
+function gradientAvatarKey(seed) {
+  let h = 5381
+  for (let i = 0; i < seed.length; i++) {
+    h = ((h << 5) + h) ^ seed.charCodeAt(i)
+    h >>>= 0
+  }
+  return `gradient-avatar-${(h % 6) + 1}`
+}
 
 exports.main = async event => {
   const { OPENID } = cloud.getWXContext()
@@ -35,7 +40,7 @@ exports.main = async event => {
   }
 
   // New user — create with sensible defaults
-  const avatarKey = AVATAR_KEYS[Math.floor(Math.random() * AVATAR_KEYS.length)]
+  const avatarKey = gradientAvatarKey(OPENID)
   const user = {
     openid: OPENID,
     nickname: event.userInfo?.nickname || '宠物达人',
@@ -48,7 +53,7 @@ exports.main = async event => {
     level: 1,
     bio: '',
     verified: false,
-    stats: { posts: 0, following: 0, followers: 0, favorites: 0 },
+    stats: { posts: 0, following: 0, followers: 0 },
     preferences: { notifications: true, nearbyVisible: true },
     createdAt: now,
     lastLoginAt: now