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>

tests/test_workspace_v810.py

@@ -9,7 +9,7 @@ def test_default_workspace_has_guided_navigation(client):
     page=client.get('/')
     assert page.status_code==200
     for label in ('工作台','我的网站','网站概览','内容与页面','外观与设计',
-                  '导入与迁移','构建与交付','网站设置','高级工具'):
+                  '导入与迁移','生成与预览','检查并上线','网站设置','高级工具'):
         assert label in page.text
     assert '/ui/workspace.js' in page.text
     assert '/ui/workspace.css' in page.text