Properly forward multipart FormData and set route handler body size limit

Shipped: April 11, 2026 at 4:33 AM UTC
Author: kamo
Commit: e2b5914

- Revert to parsing FormData and rebuilding for forwarding (fixes MalformedStreamException from raw arrayBuffer forwarding) - Add routeHandlerBodySizeLimit: 500mb to next.config.mjs experimental config to allow large file uploads in route handlers

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