Port Hyper, GitKraken AI, and Bifrost providers

[Finesssee]

Summary

Ports the upstream v0.65 provider pack for Charm Hyper, GitKraken AI, and Bifrost. Adds provider registration and settings integration, including Bifrost gateway configuration. The Bifrost virtual-key header is prevented from following gateway redirects; GitKraken shared-pool usage stays display-only.

This is the first implementation unit in the v0.65/v0.66 port plan. It depends on #610 and targets codex/integrate-reviewed-ports-20260923; retarget or rebase it onto main after #610 merges.

Validation

• Rust provider tests: 1,247 passed, 1 ignored.
• Rust formatting and Clippy passed.
• Tauri Clippy passed.
• Frontend provider tests: 22 passed.
• Frontend production build and locale parity check passed (882 keys).
• Frontend lint exited successfully with existing warnings.

Review status

Draft. CircleCI will run on this PR. Native Windows CUA proof for the Bifrost settings surface remains pending; the active desktop was left undisturbed.

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