[Build] chore: reorganize markdown documentation

# Operasi "Bersih-Bersih" Dokumen: Menata Ulang Harta Karun di POS --- ### Raw Commit Data ## GitHub Update **Repository:** [MKWcorp/POS-DRW-Skincare](https://github.com/MKWcorp/POS-DRW-Skincare) **Author:** MKWcorp **Date:** 5/6/2026, 9:25:50 PM **Commit:** [`474b42c`](https://github.com/MKWcorp/POS-DRW-Skincare/commit/474b42c61a17d270db151177f7a83004dc372185) ### Commit Message chore: reorganize markdown documentation - Move 25 historical/archived files to docs/_ARCHIVE_HISTORICAL/ - Remove 12 deprecated bugfix and implementation files - Create docs/INDEX.md for documentation navigation - Consolidate essential and relevant docs for refactor/phase-0-architecture-exec branch Files moved to archive: - Phase 0-7 refactor plans (already executed) - Historical smoke tests and completion reports - Deprecated API change requests and requirements - Old release notes and changelogs Files deleted: - Bugfix notes (already fixed in codebase) - Historical implementation notes - Deprecated API request files This cleanup improves documentation clarity and reduces clutter in root directory. --- _This story was imported from historical commits._