refactor(revenue): drop standalone QR block and align promotion card with reference

The 推广收益 detail card no longer renders the QR code as its own row. The
card becomes a fixed-label info list: 推广链接 [Url][复制链接][推广海报] /
佣金比例 / 累计佣金 / 返佣详解, mirroring the reference theme's 推广中心 card.

- profile-revenue.php: QR row removed; poster button moved into the link row and
  gated server-side on the poster switch; copy label now 复制链接; 推广人数 row
  dropped; 返佣详解 heading reads the existing pay_rebate_text_details_title;
  dead $vip_ratios, aksrt-revenue-page class and data-min-amount removed
- new affiliate-poster-modal.php: poster previews in a modal before download
  (reuses .uc-modal + single-render guard), since the QR now only exists inside
  the poster
- credits.js: renderAffiliateQr and its call deleted, along with the dead
  [data-affiliate-payers] lookup and the inline ch-width hack; initAffiliatePoster
  builds the poster into the modal stage and reveals 保存海报
- PaymentRuntime: expose affiliate details_title
- user-center.js: remove never-defined AKSRTRevenueCenterInit guards (2 sites)
- CSS: revenue-earnings.css pruned to live rules plus the new link-row grid and
  poster stage styles; routes/user-center/revenue.css pruned to its only
  definitions; dead leaves routes/revenue.css and routes/commerce.css deleted and
  dequeued from the user-center part list
- tests: referral-qr-contract test 2 rewritten for the QR-free card, link row and
  poster modal; post-visual-contract leaf list updated with regression guards

qrcode.min.js stays enqueued — buildPosterCanvas still draws the QR inside the
poster. Net -833 lines.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Settings/PaymentRuntime.php

@@ -343,6 +343,7 @@ class PaymentRuntime {
             'window_days' => (int) CreditsRuntime::get_referral_settings()['window_days'],
             'settlement_days' => max(0, min(90, (int) ($settings['affiliate_settlement_days'] ?? 7))),
             'promotion_text' => sanitize_textarea_field((string) ($settings['pay_rebate_text_details'] ?? '')),
+            'details_title' => sanitize_text_field((string) ($settings['pay_rebate_text_details_title'] ?? '返佣详解')),
             'poster' => [
                 'enabled' => !isset($settings['pay_rebate_poster_s']) || !empty($settings['pay_rebate_poster_s']),
                 'image' => esc_url_raw((string) ($settings['pay_rebate_poster_img'] ?? '')),