feat: add guest mode and optimize login experience

针对微信审核要求新增游客浏览模式，用户可无需登录直接浏览应用内容，仅在使用发布、点赞、记录等需要身份的功能时才弹窗引导登录。具体修改包括：
1. 新增游客态判断工具函数与登录守卫逻辑
2. 为登录页添加游客直接进入入口
3. 为首页、酒友圈、个人页、动态页、记录页添加游客适配逻辑
4. 优化登录态失效处理逻辑，不再强制跳转登录页
5. 调整部分页面的返回逻辑适配分享直接进入场景
6. 为各页面添加游客引导UI与交互

pages/profile/profile.vue

@@ -173,7 +173,7 @@
 
 <script>
 import AchievementBadge from '../../components/AchievementBadge.vue'
-import client, { clearAuth, GetAchievements } from '../../common/api'
+import client, { clearAuth, GetAchievements, isLoggedIn, requireLogin } from '../../common/api'
 import { checkAchievements, getCatIcon, isIconPath, calcLocalStreak, isValidAvatar } from '../../common/utils'
 import { ACHIEVEMENTS, DRINK_CATEGORIES } from '../../common/constants'
 import themeMixin from '../../common/theme-mixin'
@@ -391,16 +391,12 @@ export default {
       uni.switchTab({ url: '/pages/index/index' })
     },
     goRecord() {
+      if (!requireLogin()) return
       uni.navigateTo({ url: '/pages/record/record' })
     },
     checkLoginState() {
-      const isLoggedIn = uni.getStorageSync('is_logged_in')
-      const isGuest = uni.getStorageSync('is_guest')
-      if (!isLoggedIn || isLoggedIn !== 'true') {
-        uni.reLaunch({ url: '/pages/login/login' })
-        return
-      }
-      this.isGuest = isGuest === 'true'
+      // 微信审核要求：游客可停留在"我的"页浏览，不强制跳转登录，仅展示登录入口
+      this.isGuest = !isLoggedIn()
     },
     handleLogout() {
       uni.showModal({
@@ -411,7 +407,10 @@ export default {
         success: (res) => {
           if (res.confirm) {
             clearAuth()
-            uni.reLaunch({ url: '/pages/login/login' })
+            // 退出后以游客身份留在当前页继续浏览，不强制跳登录
+            this.isGuest = true
+            this.loadData()
+            uni.showToast({ title: '已退出登录', icon: 'none' })
           }
         }
       })
@@ -437,6 +436,63 @@ export default {
   padding-bottom: calc(env(safe-area-inset-bottom) + 40rpx);
 }
 
+/* 游客登录引导卡片 */
+.guest-login-card {
+  display: flex;
+  align-items: center;
+  gap: $sp-md;
+  margin: 0 $sp-lg $sp-md;
+  padding: $sp-md $sp-lg;
+  border-radius: $radius-lg;
+  background: rgba(232, 168, 56, 0.08);
+  border: 2rpx solid rgba(232, 168, 56, 0.25);
+
+  &:active {
+    background: rgba(232, 168, 56, 0.14);
+  }
+}
+
+.guest-login-icon {
+  width: 72rpx;
+  height: 72rpx;
+  border-radius: $radius-full;
+  background: $bg-card;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 40rpx;
+  flex-shrink: 0;
+}
+
+.guest-login-text {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 4rpx;
+  min-width: 0;
+}
+
+.guest-login-title {
+  font-size: $fs-sm;
+  font-weight: $fw-bold;
+  color: $text-primary;
+}
+
+.guest-login-desc {
+  font-size: $fs-xs;
+  color: $text-tertiary;
+}
+
+.guest-login-btn {
+  font-size: $fs-sm;
+  font-weight: $fw-bold;
+  color: $text-on-amber;
+  background: linear-gradient(135deg, $amber-light, $amber-deep);
+  padding: $sp-xs $sp-lg;
+  border-radius: $radius-full;
+  flex-shrink: 0;
+}
+
 /* === 沉浸式头部 === */
 .hero-header {
   position: relative;