upgrade: adopt V8.31.1 (theme 1.3/1.4 redesigns, editor deep-canvas, guided launch, component library)

Overlay 190 upstream items (V8.22→8.31) preserving trade-pro theme,
registry tests, and design docs. Re-applied full patch set on identical
anchors (discovery/env_for/blocks.css/type-mapping/locale-override/
theme_color/frontend entries/test_theme_pro_v3 mods) plus compose pins.

Verified: theme suites 35/35; dual-baseline full run 415 passed vs
pristine 386+29 ours, FAILED-set diff EMPTY (same 10 Windows env fails).
Live: container 8.31.1-dev.1 healthy, hesupipe 192 entries intact,
trade-pro build 203 pages 0 errors.

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

themes/corporate/pages/home.html

@@ -2,3 +2,5 @@
 {% if features %}<section class="pro-section pro-featured"><div class="pro-wrap">{{section_title('WHAT WE DO','我们的业务','/services/')}}{{grid(features,'service')}}</div></section>{% endif %}
 <section class="pro-section pro-statement"><div class="pro-wrap pro-statement-layout"><span class="pro-eyebrow">ABOUT THE COMPANY</span><div><h2>以专业连接价值，以合作创造可能。</h2><p>{{site.tagline or '在这里展示企业愿景、使命与长期能力。'}}</p><a class="pro-text-link" href="/about/">了解我们 ↗</a></div></div></section>
 {% if cases %}<section class="pro-section pro-case-section"><div class="pro-wrap">{{section_title('SELECTED WORK','代表项目','/cases/')}}{{grid(cases,'case')}}</div></section>{% endif %}
+
+{% if stories %}<section class="pro-section pro-v30-home-editorial"><div class="pro-wrap">{{section_title('LATEST THINKING','最新资讯','/news/')}}{{grid(stories,'news')}}</div></section>{% endif %}