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/dbcli/dbcli.go

@@ -115,22 +115,25 @@ func cmdMaint(args []string, _ string, path string) int {
 
 func cmdCleanup(args []string) int {
 	fs := flag.NewFlagSet("cleanup", flag.ExitOnError)
-	policy := fs.String("policy", "", "cleanup policy name")
+	policyID := fs.String("policy-id", "", "maintenance policy UUID")
 	dryRun := fs.Bool("dry-run", true, "dry run")
-	limit := fs.Int("limit", 10000, "max rows")
 	apiURL := fs.String("api-url", "", "control plane base URL")
 	token := fs.String("token", "", "Bearer token (operator)")
 	_ = fs.Parse(args)
-	if *policy == "" {
-		fmt.Fprintln(os.Stderr, "cleanup: --policy is required")
+	if *policyID == "" {
+		fmt.Fprintln(os.Stderr, "cleanup: --policy-id is required")
 		return 2
 	}
 	if *apiURL == "" || *token == "" {
 		fmt.Fprintln(os.Stderr, "cleanup: --api-url and --token are required")
 		return 2
 	}
-	payload := map[string]any{"policy": *policy, "dry_run": *dryRun, "limit": *limit}
-	body, err := apiPOST(*apiURL, *token, "/v1/postgres/cleanup", payload)
+	path := "/v1/maintenance/run"
+	if *dryRun {
+		path = "/v1/maintenance/dry-run"
+	}
+	payload := map[string]any{"policy_id": *policyID}
+	body, err := apiPOST(*apiURL, *token, path, payload)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		return 1