feat: 接口错误处理增强，统一打印并展示后端错误信息

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/components/selectMemberDrawer/selectMemberDrawer.ts

@@ -135,8 +135,9 @@ Component({
                         }))
                         this.setData({ members })
                     })
-                    .catch(() => {
-                        wx.showToast({ title: '加载失败', icon: 'none' })
+                    .catch((err: any) => {
+                        console.error('[selectMemberDrawer] 加载成员失败:', err)
+                        wx.showToast({ title: err?.msg || err?.message || '加载失败', icon: 'none' })
                     })
                     .finally(() => {
                         wx.hideLoading()
@@ -159,8 +160,9 @@ Component({
                         }))
                         this.setData({ members })
                     })
-                    .catch(() => {
-                        wx.showToast({ title: '加载失败', icon: 'none' })
+                    .catch((err: any) => {
+                        console.error('[selectMemberDrawer] 加载成员失败:', err)
+                        wx.showToast({ title: err?.msg || err?.message || '加载失败', icon: 'none' })
                     })
                     .finally(() => {
                         wx.hideLoading()