Prepare production branch: remove test files and add Dockerfile

- Remove all test files (__tests__, *.test.*, *.spec.*)
- Remove Jest configuration files (jest.config.js, jest.setup.js)
- Remove test-related scripts from package.json
- Remove Jest dependencies from package.json
- Add production Dockerfile for standalone Next.js app
- Update tsconfig.json exclusions

🤖 Generated with [Claude Code](https://claude.ai/code)

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

jest.setup.js

@@ -1,48 +0,0 @@
-import '@testing-library/jest-dom'
-
-// Mock next/navigation
-jest.mock('next/navigation', () => ({
-  useRouter() {
-    return {
-      push: jest.fn(),
-      replace: jest.fn(),
-      prefetch: jest.fn(),
-      back: jest.fn(),
-      forward: jest.fn(),
-      refresh: jest.fn(),
-    }
-  },
-  usePathname() {
-    return ''
-  },
-  useSearchParams() {
-    return new URLSearchParams()
-  },
-}))
-
-// Mock localStorage
-const localStorageMock = {
-  getItem: jest.fn(),
-  setItem: jest.fn(),
-  removeItem: jest.fn(),
-  clear: jest.fn(),
-}
-global.localStorage = localStorageMock
-
-// Mock fetch
-global.fetch = jest.fn()
-
-// Mock socket.io-client
-jest.mock('socket.io-client', () => ({
-  io: jest.fn(() => ({
-    emit: jest.fn(),
-    on: jest.fn(),
-    disconnect: jest.fn(),
-    join: jest.fn(),
-  })),
-}))
-
-// Cleanup after each test
-afterEach(() => {
-  jest.clearAllMocks()
-})