feat: enhance README and TODO documentation, implement mobile menu functionality in Header component

- Updated README.md with project details, quick start instructions, and tech stack.
- Expanded TODO.md to reflect current project status and backlog items, including Linear ticket synchronization.
- Added mobile menu toggle functionality in Header component with corresponding tests for user interactions.
- Configured Next.js for Docker deployment and optimized build settings.

proto/jest.globalTeardown.integration.js

@@ -0,0 +1,8 @@
+// Global teardown for integration tests
+module.exports = async () => {
+  console.log('🧹 Cleaning up integration test environment...')
+  
+  // Clean up any test data or connections if needed
+  // For now, just log completion
+  console.log('✅ Integration test cleanup completed.')
+}