chore: baseline V8.10.0-dev.1 with v8_workflows type-mapping fix and trade-pro spec

- SiteForge Enterprise V8.10.0-dev.1 upstream source (210 tests)
- Fix: v8_workflows._mapped_input now reads both 类型/分类 columns so WXR
  imports keep post/product types instead of collapsing to page
- Docs: trade-pro theme port spec (R3) and implementation plan

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

compose.mysql-secrets.yaml

@@ -0,0 +1,8 @@
+# Optional overlay: create private_secrets/ and private_ca/ on the Docker host.
+# docker compose -f compose.yaml -f compose.mysql-secrets.yaml up -d --build
+# These paths must never be committed or copied into the application image.
+services:
+  worker:
+    volumes:
+      - ./private_secrets:/run/secrets:ro
+      - ./private_ca:/etc/siteforge/certs:ro