docs: update implementation plan and add backend completion summary

- Mark backend as complete in IMPLEMENTATION_PLAN.md
- Create ADMIN_BACKEND_COMPLETE.md with full documentation
- Document all API endpoints
- Add testing instructions
- Add deployment notes
This commit is contained in:
dwindown
2025-10-11 14:37:18 +07:00
parent 12850ab12d
commit 1c28e51b53
13 changed files with 464 additions and 224 deletions

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