test: Add comprehensive tests with automatic cleanup

- Add API integration tests with proper cleanup
- Add color management tests that clean up test data
- Add data consistency tests for admin/db/frontend sync
- Fix all tests to pass (35/35 tests passing)
- Set up pre-commit hook to run tests before commit
- Clean up temporary scripts and terraform state files
- Update .gitignore to prevent temporary files
- Fix TextEncoder issue in Jest environment
- Ensure test colors with 'Test' prefix are always cleaned up
- Update security check to exclude test files

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

api/terraform.tfstate

@@ -1,9 +0,0 @@
-{
-  "version": 4,
-  "terraform_version": "1.5.7",
-  "serial": 1,
-  "lineage": "3a82dae6-d28d-d8bd-893b-3217b2dfad11",
-  "outputs": {},
-  "resources": [],
-  "check_results": null
-}