Patch Changes

• 6a823a6: feat(gateway): expose ruleId on GatewayForbiddenError so callers can identify which routing rule denied a request
• ed8b811: Backport: chore(provider/gateway): update gateway model settings files
• 4f00314: Backport: chore(provider/gateway): update gateway model settings files
• 8549807: feat(provider/openai,provider/gateway): add gpt-5.6 model ids
• 3c89617: feat (provider/xai): add grok-4.5 model id