Port Muse Code subscription usage

[Finesssee]

Summary

• Add the Muse Code subscription provider from upstream 0.61.0.
• Read the existing Muse device-code OAuth credential from the local auth file, with controlled environment overrides.
• Parse the five-hour and weekly subscription windows, plan, and account email without exposing inference keys or writing credentials.
• Register Muse across the Rust provider catalog, factory, CLI aliases, settings source policy, tray/dashboard catalogs, and provider icons.
• Bound streamed API responses incrementally so oversized chunked responses cannot be buffered without a limit.
• Preserve upstream fractional window-duration rounding behavior.

Validation

• cargo test --manifest-path rust/Cargo.toml muse -- --nocapture — 10 Muse tests passed (12 filtered tests including shared provider/meta coverage)
• cargo test --manifest-path rust/Cargo.toml --lib --quiet — 1,937 passed, 1 ignored
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml commands::tests --quiet — 94 passed
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings — passed
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings — passed
• cargo fmt --all and git diff --check — passed

Frontend Vitest and fresh Tauri UI/CUA proof were not run because this checkout has no apps/desktop-tauri/node_modules; installing dependencies would consume the storage budget during the port batch. Hosted CI should provide the frontend validation.

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