Port 0.61.0 Grok reset coupons

[Finesssee]

Summary

• Port upstream 0ead0d678 (0.61.0) Grok usage-limit reset coupons.
• Query GetRemainingResets with the same successful bearer or exact-cookie principal used for billing.
• Parse gRPC-web coupon records, discard blank or expired records, sort by expiry, and expose only count/title/next expiry through the transient inventory channel from Port 0.61.0 transient provider inventory plumbing #560.
• Keep coupon token IDs private to the parser and keep secondary lookup failures best effort.

Dependency

This PR is intentionally based on codex/port-0.61.0-inventory and depends on PR #560. It should be reviewed after the shared carrier is accepted.

Validation

• cargo test --manifest-path rust/Cargo.toml --lib providers::grok::billing::tests — 16 passed
• cargo test --manifest-path rust/Cargo.toml --lib cli::usage::tests — 15 passed
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
• cargo check --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml commands::tests::provider_inventory_maps_to_the_bridge_without_token_ids — 1 passed
• cargo fmt --all

Frontend tests were not run because apps/desktop-tauri/node_modules is absent; no dependency install or frontend build was started.

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