docs(api): sync OpenAPI specs with current backend handlers

- Field-level corrections across all modules (on-call, monitors, rum,
  platform, safari): fix request/response property types, binding-derived
  constraints (required/min/max/oneof), omitempty nullability, enums, and
  missing or inaccurate descriptions
- Remove retired monitors endpoints /monit/rule/status, /monit/preview/sync
  and /monit/query/rows from the specs and API catalog; update CLI and
  Go SDK references accordingly
- Enrichment mapping data: document the real CSV download stream and the
  multipart/form-data upload contract (schema_id query param, file field)
- Unify request/response examples between the English and Chinese specs

Author: ysyneu