Move backend to Bun + Elysia

[tomouchuu]

Big code change to move away from nodejs + express + node-media-server to a Bun powered Elysia server.

Presently we'll lose the upload functionality for now but it should give us a massive stability and performance benefit over the previous node solution.

Blocking Issues:

• [x] No Transcriptions
• [x] No Translations
• [x] It takes a little bit of time to sometimes generate a m3u8 file
• [x] Test deployments on Railway

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 524d3e4b79f12378c90fa56a9088ad5ba0c26ec0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | ----------------- | ----- | | @haishin/utils | Minor | | @haishin/backend | Major | | @haishin/frontend | Minor | | @haishin/tsconfig | Major |

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