feat: integrate angular-oauth2-oidc for authentication

- Added angular-oauth2-oidc package to package.json.
- Configured OAuth client in app.config.ts with resource server settings.
- Implemented login component with basic HTTP request to fetch products.
- Set up routing for the login component.
- Updated app component to initialize OAuth service and handle login.
- Modified default app settings to open and collapse sidenav by default.
- Removed placeholder content from app.html to streamline the initial view.

Api/appsettings.json

@@ -14,5 +14,5 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "http://localhost:4200"
 }