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>

jest.setup.js

@@ -1 +1,6 @@
-import '@testing-library/jest-dom'
+import '@testing-library/jest-dom'
+
+// Add TextEncoder/TextDecoder globals for Node.js environment
+const { TextEncoder, TextDecoder } = require('util');
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;