Smarter ZIP uploads & editable build config
Several quality-of-life upgrades to Rapids ZIP-upload deployments — wrapper-folder zips just work, build settings are editable after creation, and the upload form now tells you what is happening.
What's changed
- Auto-unwrap single-folder ZIPs — no more "Dockerfile not found" when you used `zip -r foo.zip myproject/`
- Friendlier build errors that point you to the wrapper-folder fix when manifest files are missing
- Edit build configuration after creation — switch between Buildpacks and Dockerfile, change the Dockerfile path, source directory, or buildpack builder. Saving rebuilds from your last upload
- Post-upload "Follow build" + "Cancel build" buttons replace the upload form so it is clear a build is running
- Reserved-port validation: friendly error if you pick a port already in use by the platform, with a documented reserved list
- Uploaded ZIPs are now kept in object storage, so manual rebuilds and Retry no longer require re-uploading