Gengchou v2.2.1

This patch restores Antigravity's 5-hour quota window while preserving the
weekly window introduced by the provider's newer quota-summary response.

Fixes

Fetch Antigravity's per-model 5-hour quota and weekly quota summary
independently, then merge them into the existing dynamic-window model.
Keep either Antigravity window available when the other endpoint is
temporarily unavailable instead of dropping all usage data.
Deduplicate legacy responses that still expose a 5-hour bucket through the
weekly-summary endpoint.
Accept the nested quotaSummary.groups response shape and infer known
durations from bucket identifiers when the API omits an explicit window.
Preserve weekly-only accounts without inventing a misleading 5-hour row.

No settings or cache migration is required. Existing v2.2.0 installations can
update in place through Gengchou's built-in updater.