rust: Upgrade to HTTP API

[GermanCoding]

No description provided.

[secana]

In the justfile it has to be:

populate-rust-env:
  cp .env.https rust/.env

Else the old WSS env vars are taken and the tests fails.

EDIT: I fixed it to proceed with the tests and review.

[secana]

Overall: Greate PR! The HTTP API is much easier than the old WSS. Very clean und readable code!

• I skimped over the code, it's a lot but looks good
• I ran all tests with just test-rust

Issue: When using it in gdcli to scan a a few thousand files it dies with 2026-02-24T08:25:31.343799Z WARN gdcli: Failed to get scan result: VaaS error: Request was canceled. Could be the API hammering or our servers not beeing able to handle many files? So maybe not an issue in the vaas sdk but in the client/server that needs to back up if there are too many files in the processing. I did not have this with the wss API, though.

[GermanCoding]

Issue: When using it in gdcli to scan a a few thousand files it dies with 2026-02-24T08:25:31.343799Z WARN gdcli: Failed to get scan result: VaaS error: Request was canceled. Could be the API hammering or our servers not beeing able to handle many files? So maybe not an issue in the vaas sdk but in the client/server that needs to back up if there are too many files in the processing. I did not have this with the wss API, though.

Request was canceled is a client-side error triggered by the client's CancellationToken requesting cancel. Many simultaneous requests may cause delays in individual scans, if you're canceling requests quickly this may happen before analysis completes.

[secana]

From my perspective you can squash and merge this PR. It's a breaking change as the authentication methods changed, so a major version bump seems appropriate.