feat(skills): publish stock-chan-analysis to skills/public

[Richard8610]

Summary

• Promotes the stock-chan-analysis skill from skills/custom/ (per-user, not shared) to skills/public/ (global, shared across users)
• Skill performs Chan Theory (缠论) multi-timeframe structural analysis on A-share stocks, generating interactive HTML reports with TradingView charts
• Excludes the output/ sample report (generated artifact, not skill source)
• Fixed a trailing-period typo in the references/chan_rules.md link that tripped the resource-reachability check

Test plan

• Ran python -m deerflow.skills.review.cli skills/public/stock-chan-analysis --format text --fail-on error --fail-on-incomplete locally — 0 blockers, 0 errors, 2 benign warnings (internal-use files not directly referenced in SKILL.md, expected)
• skill-review-ci.yml passes on this PR

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