fix(revenue): replicate the reference rebate poster canvas layers

The poster modal shell already matched the reference theme, but the canvas
drawing diverged from zibll's poster-share.js rebate branch in four places:

- No 推荐人 tags layer. The reference paints a red #fc4e1f 24px line at
  img_height+160; AKSRT dropped the layer entirely, so the poster lost the
  referrer attribution that identifies whose link it is.
- The logo slot painted text. The reference contains the real logo image
  into (80, height-190, 300, 100); AKSRT drew the site name as a 30px string
  plus a hardcoded 长按识别二维码访问 caption in that slot.
- Bottom copy was hardcoded. The reference reads share_desc; now sourced
  from the new pay_rebate_poster_desc_bottom field with share_desc fallback.
- No banner fallback. The reference walks banner → banner_default →
  banner_spare; a single broken URL left the top half of the poster black.

Also aligns the week label to the reference's 周 prefix (was 星期日) and ports
drawTextOverflow for wrapping/truncation, which retires the local wrapText.

Adds pay_rebate_poster_banner and pay_rebate_poster_desc_bottom to both the
Vue and PHP schemas; rest_me now returns logo, compatible and referrer_name.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/admin/src/schema/sections/payment/affiliate.js

@@ -35,6 +35,8 @@ export const affiliateSchema = {
     pay_rebate_poster_img: '',
     pay_rebate_poster_title: '发现一个精品网站，快来看一看',
     pay_rebate_poster_desc: '网站有超多精品资源和优惠福利，扫码进入网站还可享受诸多优惠哦',
+    pay_rebate_poster_banner: '',
+    pay_rebate_poster_desc_bottom: '',
     pay_rebate_text_discount: '推荐购买 下单再减%discount%',
   },
   groups: [
@@ -173,6 +175,8 @@ export const affiliateSchema = {
         { key: 'pay_rebate_poster_img', label: '推广海报顶部图片', type: 'media', default: '', dependsOn: { key: 'pay_rebate_poster_s', value: true } },
         { key: 'pay_rebate_poster_title', label: '推广海报标题(20-30个字)', type: 'input', default: '发现一个精品网站，快来看一看', dependsOn: { key: 'pay_rebate_poster_s', value: true } },
         { key: 'pay_rebate_poster_desc', label: '推广海报简介(40-60个字)', type: 'input', default: '网站有超多精品资源和优惠福利，扫码进入网站还可享受诸多优惠哦', dependsOn: { key: 'pay_rebate_poster_s', value: true } },
+        { key: 'pay_rebate_poster_banner', label: '海报顶部备用图片', type: 'media', default: '', dependsOn: { key: 'pay_rebate_poster_s', value: true }, help: '顶部主图加载失败时依次回退到这里，再回退到主题内置图，避免海报顶部出现空白。' },
+        { key: 'pay_rebate_poster_desc_bottom', label: '海报底部文案', type: 'input', default: '扫描二维码阅读全文', dependsOn: { key: 'pay_rebate_poster_s', value: true }, help: '画在二维码下方居中位置，留空则使用默认文案。' },
       ],
     },
     {