feat: add proton drive upload support

[blefnk]

Hi, Mark! Thanks for building and maintaining this CLI!

And on a personal note, thank you for the work you do outside of tech as well! 🙏

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I put this together because I needed a working way to upload a file to Proton Drive from this CLI, and the current codebase was already very close.

This PR adds a basic drive upload command and fixes a few things that were getting in the way of real uploads with Proton's current API behavior.

What's included

• adds protondrive drive upload
• fixes address/keyring lookup during upload setup
• updates the app version string so upload requests are accepted
• vendors a patched go-proton-api under third_party/go-proton-api
• adds compatibility fixes for the current Proton Drive upload flow:
  • revision verification endpoint
  • block verifier token support
  • more reliable block upload request body handling
  • retry compatibility for transient upload failures

Notes

A couple of the dependency changes are bigger than I'd normally like, but I went with the most practical route to get a working upload path first.

I tested this against a real Proton account and was able to:

• log in
• list account / volume / share info
• upload a .gpg file to Proton Drive
• verify that the file appeared in the web UI

Known rough edges

• session storage is still file-backed and still has the existing security warning
• this only adds a basic upload flow (root of the selected share / primary share), not a full folder management workflow
• there may still be room to clean up how the vendored API patch is organized

If you'd prefer, I can split this into smaller PRs afterward (for example: CLI command vs API compatibility patch).

[major0]

I got a little side-tracked implementing a true POSIX/GNU option/flag parser (https://github.com/major0/optargs.git) so that I could have a real proton drive ls <options> interface. Once I was done there I was going to fully pivot back over to the proton-cli as my primary project and continue getting this fully on-online, along side a ProtonFS that can be mounted; I am nervous about some of the security implications of integrating w/ rclone. I am hoping to implement something closer to kbfs in functionality/performance.

Just a heads up, I wont have time to review this until this evening.