- Add comboRotationState Map to track rotation per combo
- Add getRotatedModels() to rotate model order based on strategy
- Pass comboName and comboStrategy to handleComboChat()
- Add comboStrategy setting (default: fallback)
- Add UI toggle for Combo Round Robin in profile settings
When enabled, each request to a combo starts with a different provider
instead of always starting with the first one, distributing load evenly.
Co-authored-by: Antigravity Agent <antigravity@example.com>
- fixes#335: on transient 503/502/504, wait for short cooldown (up to
5s) before falling to next combo model, giving the provider a chance
to recover rather than immediately skipping it
- fixes#334: when all combo models have no active credentials, return
503 (Service Unavailable) instead of 406 (Not Acceptable), which is
more accurate and retriable by clients
