feat: implement intern authentication and secure document dashboard for internship applications

app/Models/CareerApplication.php

@@ -21,5 +21,20 @@ class CareerApplication extends Model
         'ai_usage',
         'message',
         'status',
+        'username',
+        'password',
+        'signed_internship_form_path',
     ];
+
+    /**
+     * Get the attributes that should be cast.
+     *
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'password' => 'hashed',
+        ];
+    }
 }