api

- GET /uuid/:uuid
- skip verify_authenticity_token for POST /movies/
- POST movie with remote file urls
- ping callback url when conversion complete(web hook)
  - passing movie uuid

client implementation: https://github.com/shin1ohno/jani-converter_client/pull/1/files

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@l15n please review
Currently, we deploy this app to internal network. So we can trust the client. I think I have to do some authentication thing coming future like once token or OAuth app authentication.