Monitor rate limits progress

Implement monitor-rate-limits edge function to compare metrics against alert configurations, trigger notifications, and record alerts; update config and groundwork for admin UI integration.

supabase/migrations/20251111001647_55966c93-7179-4c9a-bbf8-d527edad506a.sql

@@ -0,0 +1,22 @@
+-- Fix security warning: Set search_path for rate limit alert function
+-- Drop trigger first, then function, then recreate with proper search_path
+
+DROP TRIGGER IF EXISTS update_rate_limit_alert_config_updated_at ON public.rate_limit_alert_config;
+DROP FUNCTION IF EXISTS update_rate_limit_alert_config_updated_at();
+
+CREATE OR REPLACE FUNCTION update_rate_limit_alert_config_updated_at()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = public
+AS $$
+BEGIN
+  NEW.updated_at = now();
+  RETURN NEW;
+END;
+$$;
+
+CREATE TRIGGER update_rate_limit_alert_config_updated_at
+BEFORE UPDATE ON public.rate_limit_alert_config
+FOR EACH ROW
+EXECUTE FUNCTION update_rate_limit_alert_config_updated_at();