fix: update aggr_window description in API docs

[pijiang3]

Summary

• Update dispatch policy aggr_window field descriptions from aggregation window to delay window
• Keep on-call split OpenAPI files and consolidated OpenAPI reference files in sync

Validation

• python3 -m json.tool api-reference/on-call.openapi.zh.json >/dev/null
• python3 -m json.tool api-reference/on-call.openapi.en.json >/dev/null
• python3 -m json.tool api-reference/openapi.zh.json >/dev/null
• python3 -m json.tool api-reference/openapi.en.json >/dev/null

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
flashduty	🟢 Ready	View Preview	Jul 3, 2026, 10:08 AM

💡 Tip: Enable Workflows to automatically generate PRs for you.