refactor(maintenance): remove hardcoded retention and wire scheduler

RunPeriodicMaintenance и RunCleanup удалены; scheduler политик в StartBackground; deprecated /postgres/cleanup принимает policy_id.

Co-authored-by: Cursor <[email protected]>

internal/repository/maintenance.go

@@ -1,29 +1,8 @@
 package repository
 
-import (
-	"context"
-	"time"
-)
+import "context"
 
-const (
-	jobAuditRetentionDays = 90
-	asnCacheRetentionDays = 7
-)
-
-// RunPeriodicMaintenance prunes stale job_audit and asn_prefix_cache rows (PostgreSQL).
+// RunPeriodicMaintenance is a no-op; retention is driven by maintenance_policy rows (UI-configured).
 func (p *Postgres) RunPeriodicMaintenance(ctx context.Context) {
-	if p == nil || p.pool == nil {
-		return
-	}
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	jobCutoff := time.Now().UTC().Add(-time.Duration(jobAuditRetentionDays) * 24 * time.Hour)
-	_, _ = p.pool.Exec(ctx, `
-		DELETE FROM job_audit
-		WHERE created_at < $1
-		  AND status IN ('succeeded', 'failed', 'cancelled')`, jobCutoff)
-	asnCutoff := time.Now().UTC().Add(-time.Duration(asnCacheRetentionDays) * 24 * time.Hour)
-	_, _ = p.pool.Exec(ctx, `
-		DELETE FROM asn_prefix_cache WHERE fetched_at < $1`, asnCutoff)
+	_ = ctx
 }