feat: implement authentication context and hooks for user management

- Add AuthContext to manage user authentication state and token storage.
- Create hooks for login, registration, and logout functionalities.
- Implement dashboard layout with authentication check and loading state.
- Enhance dashboard page with channel management features including create, edit, and delete channels.
- Integrate API calls for channel operations and current broadcast retrieval.
- Add stream URL resolution via server-side API route to handle redirects.
- Update TV page to utilize new hooks for channel and broadcast management.
- Refactor components for better organization and user experience.
- Update application metadata for improved branding.

k-tv-frontend/app/layout.tsx

@@ -14,8 +14,8 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
-  description: "Generated by create next app",
+  title: "K-TV",
+  description: "Self-hosted linear TV channel orchestration for your media library",
 };
 
 export default function RootLayout({