docs(auth): add callback implementation instruction

Author: Bapawe

packages/auth/src/Installer/OAuthInstaller.php

@@ -45,7 +45,8 @@ public function install(): void
             '',
             'Next steps:',
             '1. Update the .env file with your OAuth credentials',
-            '2. Review and customize the published files if needed',
+            '2. Implement the OAuth controller callback method',
+            '3. Review and customize the published files if needed',
             '',
             '<strong>Published files</strong>',
             ...arr($this->publishedFiles)->map(fn (string $file) => '<style="fg-green">→</style> ' . $file),

packages/auth/src/Installer/oauth/OAuthControllerStub.php

@@ -32,6 +32,8 @@ public function redirect(): Redirect
     #[Get('callback-route')]
     public function callback(Request $request): Redirect
     {
+        // TODO: implement, the code below is an example
+
         $this->oauth->authenticate(
             request: $request,
             map: fn (OAuthUser $user): Authenticatable => query('user-model-fqcn')->updateOrCreate([