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.setup.integration.js

@@ -0,0 +1,22 @@
+// Jest setup for integration tests
+const { fetch, Headers, Request, Response } = require('undici')
+
+// Polyfill fetch for Node.js environment
+if (!global.fetch) {
+  global.fetch = fetch
+  global.Headers = Headers
+  global.Request = Request
+  global.Response = Response
+}
+
+// Set longer timeout for integration tests
+jest.setTimeout(30000)
+
+// Global test environment setup
+beforeAll(() => {
+  console.log('🚀 Starting integration test suite...')
+})
+
+afterAll(() => {
+  console.log('✅ Integration test suite completed.')
+})