Batch 1 of Phase 2: migrate 3-4 edge functions to use createEdgeFunction wrapper (process-selective-approval, process-selective-rejection, rate-limit-metrics) to enable automatic error logging, CORS, auth, and reduced boilerplate; preserve existing logic where applicable and prepare for subsequent batches.
Add an edge function rate-limit-metrics to expose metrics via API, including authentication guards, CORS headers, and multiple query endpoints for recent metrics, stats, and function/user/IP-specific data. Integrates with new metrics and auth helpers and uses existing rate limiter.
