Fix design-system paths in generated docs

[lswxcs]

Summary
Fix the path hints in generated design-system docs so they match the actual persisted structure under design-system/<project_slug>/.

Changes

• Add project_slug in format_master_md and format_page_override_md.
• Update MASTER.md hint to design-system/<project_slug>/pages/[page-name].md.
• Update page override hint to design-system/<project_slug>/MASTER.md.
• Sync design_system.py across all skill copies and CLI assets:
  • skills/ui-ux-pro-max/
  • .claude/, .codex/, .continue/, .gemini/, .shared/, .trae/
  • cli/assets/.claude/, .codex/, .continue/, .gemini/, .shared/, .trae/

Verification

• Ran:
  python3 skills/ui-ux-pro-max/scripts/search.py "SaaS dashboard" --design-system --persist -p "Demo Project 3" --page "dashboard" -o /tmp/uipro-repro-3
• Confirmed generated docs contain:
  • design-system/demo-project-3/pages/[page-name].md in MASTER.md
  • design-system/demo-project-3/MASTER.md in page override

Checklist

• Conformed to CLAUDE.md sync rules (scripts copied to .shared and cli/assets).
• Verified output paths manually.
• Automated tests not available in repo.