feat: support custom skills path for vendor projects

[iml885203]

Summary

Add optional skillsPath configuration to VendorSkillMeta interface to support vendor projects that store skills in non-standard directory paths.

Motivation

Some vendor projects (like ui-ux-pro-max) store their skills in custom paths such as .claude/skills instead of the default skills/ directory.

Currently, the sync script hardcodes the skills/ path, causing sync failures for these projects with the warning:

No skills directory in vendor/{name}/skills/

Changes

• meta.ts: Add optional skillsPath?: string field to VendorSkillMeta interface
• scripts/cli.ts:
  • Add skillsPath to VendorConfig interface
  • Update syncSubmodules() to use vendorConfig.skillsPath || 'skills' with fallback
  • Update SYNC.md generation to reflect the actual source path

Example Usage

export const vendors: Record<string, VendorSkillMeta> = {
  'ui-ux-pro-max': {
    source: 'https://github.com/nextlevelbuilder/ui-ux-pro-max-skill',
    skillsPath: '.claude/skills', // Custom path
    skills: {
      'ui-ux-pro-max': 'ui-ux-pro-max',
    },
  },
}

Backward Compatibility

✅ Fully backward compatible - existing vendors without skillsPath continue to use the default 'skills' directory.

Test Plan

• Tested with existing vendors (vueuse, slidev, etc.) - works as before
• Tested with custom path (.claude/skills) - successfully syncs from non-standard paths
• Verified SYNC.md reflects correct source path