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>

scripts/verify_art_design_pro_v819.py

@@ -21,7 +21,7 @@ def verify(path: Path, build: bool = False) -> dict:
     if not manifest.is_file():
         raise ValueError('安装清单缺失，请执行安装器 --apply')
     data = json.loads(manifest.read_text(encoding='utf-8'))
-    if data.get('siteforge_version') != '8.21.3-dev.1':
+    if data.get('siteforge_version') != '8.29.0-dev.1':
         raise ValueError('安装清单版本不匹配')
     result.update({'version':data['siteforge_version'],'build':'NOT_RUN'})
     if build: