fix: pass allowedMediaTypes for R2 uploads to resolve 415 error

[vzt7]

close #45

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commit: d73429e

[Copilot]

Pull request overview

This PR fixes a 415 (Unsupported Media Type) error occurring during R2 file uploads by passing allowedMediaTypes metadata to the upload endpoint. The fix converts file extensions from the configuration into MIME types that can be validated by the better-auth framework.

• Adds MIME type conversion using the mime/lite package
• Passes allowedMediaTypes metadata to the upload endpoint configuration

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/r2.ts	Converts configured file extensions to MIME types and passes them as allowedMediaTypes metadata to the upload endpoint to enable proper content-type validation
package.json	Adds mime package (v4.1.0) as a dependency for MIME type conversion functionality

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