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>

tools/admin-contract-report.json

@@ -1,5 +1,5 @@
 {
-    "generated_at": "2026-10-13T12:53:18+00:00",
+    "generated_at": "2026-10-21T13:04:45+00:00",
     "errors": [],
     "warnings": [
         "customPage tools-update section 'tools/update' not in PHP schema (ok if pure operational page)",
@@ -252,7 +252,7 @@
         "entry": true,
         "missing_chunks": [],
         "chunks": [
-            "SchemaPage.BrFz57tJ.js",
+            "SchemaPage.CD_W16f3.js",
             "vendor-vue.BqIbVHit.js",
             "FaIcon.BMA0TNWc.js",
             "AksMediaField.C9RRDn2V.js",
@@ -268,8 +268,8 @@
             "FloatingButtonsSettings.DM1NXEcr.js",
             "PageHeader.UhySXCpq.js",
             "FooterTabbarSettings.8D3P8zNv.js",
-            "PostPageSettings.B5Sm-lcm.js",
-            "CommentSettings.DiQrTo4p.js",
+            "PostPageSettings.BjFJtDVl.js",
+            "CommentSettings.DxYhkUD2.js",
             "PermissionsCapabilities.CnQfjtxC.js",
             "CmsCredits.Dh2b9uHb.js",
             "ThemeInfoPage.zYktV7qz.js",