feat: 申诉常见理由快捷选择 + 证据截图上传

- 后端: 新增 appeal_reason_type, appeal_evidence_urls 字段
- 后端: 新建 upload_routes.py 图片上传接口
- 前端: history 页面添加快捷理由选择器 + 截图上传
- 前端: admin-review 页面展示证据图片 + 点击预览
- 新增 SQL 更新脚本 update_appeal_fields.sql

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/pages/admin-review/index.js

@@ -110,10 +110,15 @@ Page({
   },
 
   normalizeAppeals(rows = []) {
+    const baseURL = getApp().globalData.baseURL || 'http://127.0.0.1:5000/api'
+    const serverBase = baseURL.replace('/api', '')
     return rows.map((item) => ({
       ...item,
       created_text: (item.created_at || '').replace('T', ' ').slice(0, 19),
-      appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status
+      appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status,
+      appeal_evidence_urls: (item.appeal_evidence_urls || []).map((url) =>
+        url.startsWith('http') ? url : `${serverBase}${url}`
+      )
     }))
   },
 
@@ -155,8 +160,10 @@ Page({
     ].join('&')
 
     const data = await request({ url: `/admin/appeals?${query}` })
+    const normalizedAppeals = this.normalizeAppeals(data.items || [])
+    console.log('normalized appeals:', normalizedAppeals)
     this.setData({
-      appeals: this.normalizeAppeals(data.items || []),
+      appeals: normalizedAppeals,
       appealPager: buildPager(data.total || 0, appealPager.page, appealPager.pageSize)
     })
   },
@@ -294,5 +301,15 @@ Page({
     wx.showToast({ title: '申诉处理完成', icon: 'success' })
     this.setData({ [`appealNoteMap.${id}`]: '' })
     await Promise.all([this.fetchIntercepts(), this.fetchAppeals()])
+  },
+
+  previewEvidence(e) {
+    const url = e.currentTarget.dataset.url
+    const item = this.data.appeals.find((a) => a.appeal_evidence_urls && a.appeal_evidence_urls.includes(url))
+    const urls = item ? item.appeal_evidence_urls : [url]
+    wx.previewImage({
+      current: url,
+      urls
+    })
   }
 })