feat(system-builder): the system list gives each one's description, a…

[over2take]

…uthor and characters (4a2c1)

listSystems adds the draft's description and author (trimmed, '' when absent or not text) and characterCount, the players' sheets saved under the system (is_npc 0 or NULL; NPC sheets not counted), counted in the same query. For MY SYSTEMS' line items (approved mockup builder-my-systems, 2026-10-06).

Summary

Test plan

• Tested locally
• Tests pass

Pre-merge checklist

Code quality:

• Code follows project style
• No breaking changes (or clearly documented)
• No console errors or warnings

Version & Release:

• Version bumped? If releasing to users, update:
  • frontend/package.json version
  • docker-compose.yml APP_VERSION
  • CHANGELOG.md with release notes
• GitHub Actions will auto-tag Docker images with the new version

Before merging to main:

• All tests passing
• PR reviewed and approved
• Branch is up to date with main
• No merge conflicts

Related issues