fix: force JSON responses on /api/* routes

bootstrap/app.php

@@ -41,5 +41,9 @@ return Application::configure(basePath: dirname(__DIR__))
         ]);
     })
     ->withExceptions(function (Exceptions $exceptions): void {
-        //
+        // Force JSON responses on /api/* even when client did not send Accept: json.
+        $exceptions->shouldRenderJsonWhen(function (Request $request, \Throwable $e) {
+            if ($request->is('api/*')) return true;
+            return $request->expectsJson();
+        });
     })->create();