feat(task): auto-inject scheduling params into script template via scheduling_map

Add scheduling_map field to ParameterSchema so Application creators can
declare that a parameter (e.g. NP) maps to a scheduling field (e.g. cpus).
The backend auto-injects the scheduling value into script template variables
before rendering, eliminating duplicate user input. The frontend hides
mapped parameters from the form and injects their values on submit.

internal/service/cluster_service_test.go

@@ -444,6 +444,26 @@ func TestClusterService_GetPartition_ErrorLogging(t *testing.T) {
 	}
 }
 
+func TestDerefInt64ToStr(t *testing.T) {
+	t.Run("nil returns empty", func(t *testing.T) {
+		if got := derefInt64ToStr(nil); got != "" {
+			t.Errorf("derefInt64ToStr(nil) = %q, want empty", got)
+		}
+	})
+	t.Run("non-nil returns string", func(t *testing.T) {
+		v := int64(4096)
+		if got := derefInt64ToStr(&v); got != "4096" {
+			t.Errorf("derefInt64ToStr(4096) = %q, want %q", got, "4096")
+		}
+	})
+	t.Run("zero value", func(t *testing.T) {
+		v := int64(0)
+		if got := derefInt64ToStr(&v); got != "0" {
+			t.Errorf("derefInt64ToStr(0) = %q, want %q", got, "0")
+		}
+	})
+}
+
 func TestClusterService_GetDiag_ErrorLogging(t *testing.T) {
 	srv := errorServer()
 	defer srv.Close()