Raise MCP upload IP backstop to 1200/min.

Give ChatGPT's shared egress more headroom across tenants while keeping the per-workspace cap at 60.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Providers/AppServiceProvider.php

@@ -167,7 +167,7 @@ protected function configureRateLimiting(): void
 
             return [
                 Limit::perMinute(60)->by('workspace:'.$workspaceId),
-                Limit::perMinute(600)->by('ip:'.$request->ip()),
+                Limit::perMinute(1200)->by('ip:'.$request->ip()),
             ];
         });
     }