feat: add runner failover policies and traces

apps/api/internal/store/runtime_policies.go

@@ -134,6 +134,28 @@ WHERE id = $1::uuid`, platformID, cooldownSeconds)
 	return err
 }
 
+func (s *Store) DemoteCandidatePlatformPriority(ctx context.Context, platformID string, demoteStep int) error {
+	if strings.TrimSpace(platformID) == "" {
+		return nil
+	}
+	if demoteStep <= 0 {
+		demoteStep = 100
+	}
+	_, err := s.pool.Exec(ctx, `
+UPDATE integration_platforms target
+SET dynamic_priority = GREATEST(
+      COALESCE(target.dynamic_priority, target.priority),
+      COALESCE((
+        SELECT MAX(COALESCE(peer.dynamic_priority, peer.priority))
+        FROM integration_platforms peer
+        WHERE peer.deleted_at IS NULL
+      ), target.priority) + $2::int
+    ),
+    updated_at = now()
+WHERE target.id = $1::uuid`, platformID, demoteStep)
+	return err
+}
+
 func scanRuntimePolicySet(scanner runtimePolicyScanner) (RuntimePolicySet, error) {
 	var item RuntimePolicySet
 	var rateLimitPolicy []byte