fix: serve profile images with correct MIME type (closes #6)

[TusharW4ni]

Problem (#6)

server/api/users/[id]/profile.get.ts served every uploaded profile image with a hardcoded Content-Type: application/octet-stream (files are stored without an extension). Strict browsers then download the image instead of rendering it in an <img>.

Fix

Detect the real MIME type from the file's magic bytes with file-type (Option A in the issue) and set it as the Content-Type, falling back to application/octet-stream only if detection fails. Works for already-stored files too (no upload change or DB migration needed).

const detected = await fileTypeFromFile(filePath)
setHeader(event, 'Content-Type', detected?.mime ?? 'application/octet-stream')

Verification

• pnpm build succeeds — file-type bundles into the Nitro output.
• Runtime check: fileTypeFromFile on a real PNG returns { ext: 'png', mime: 'image/png' }.
• CI (pnpm test) runs on this PR.

Closes #6.

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