feat(skill): add htmlbox animated flowchart recipe

[flyinghanger]

Summary

• move the animated-flowchart generator into the existing feishu-cli-htmlbox skill as a recipe
• add pattern schema, supervisor example, and route entries in SKILL.md / references/gallery.md
• use native feishu-cli doc htmlbox create docs instead of the old API publishing script
• escape inline JSON before embedding it in <script> so captions containing </script> cannot close the script tag

Validation

• python3 -m py_compile skills/feishu-cli-htmlbox/scripts/animate_diagram.py
• generated /tmp/supervisor-animated.html from examples/supervisor.json
• injection regression check for </script> in caption/title
• opened generated HTML with headless Google Chrome via Playwright: no page errors/console errors, rendered 1 SVG / 6 nodes / 5 edges
• git diff --check

Note: go test ./... was not run because this environment has no Go toolchain installed.

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