fix: fallback customer name for dimension initialization

iam/src/main/java/com/baiyue/iam/service/CustomerDimensionInitializationRelay.java

@@ -41,9 +41,13 @@ public class CustomerDimensionInitializationRelay {
                 repository.markCancelled(task, workerId);
                 return;
             }
+            String customerName = task.customerName();
+            if (customerName == null || customerName.isBlank()) {
+                customerName = "客户-" + task.tenantId();
+            }
             ApiResponse<CustomerDimensionRuleClient.InitializationResponse> response = client.initialize(
                 internalToken, new CustomerDimensionRuleClient.InitializationRequest(
-                    task.tenantId(), task.operatorId(), task.initializationKey(), task.customerName()));
+                    task.tenantId(), task.operatorId(), task.initializationKey(), customerName));
             requireSuccess(response, true);
             if (response.data() == null || response.data().configId() == null
                 || response.data().chargeRuleId() == null) {

iam/src/test/java/com/baiyue/iam/service/CustomerDimensionInitializationRelayTest.java

@@ -70,6 +70,23 @@ class CustomerDimensionInitializationRelayTest {
             anyString(), any(Boolean.class));
     }
 
+    @Test
+    void blankCustomerNameUsesDeterministicTenantFallback() {
+        CustomerDimensionInitializationTask task = new CustomerDimensionInitializationTask(
+            10001L, 9001L, " ", "iam-customer-create:10001", "INITIALIZE", "SENDING", 0, 3);
+        when(repository.claim(anyLong(), anyString(), any(LocalDateTime.class))).thenReturn(task);
+        when(client.initialize(anyString(), any())).thenReturn(ApiResponse.success(
+            new CustomerDimensionRuleClient.InitializationResponse(91L, 191L, true)));
+
+        relay.deliver(10001L);
+
+        ArgumentCaptor<CustomerDimensionRuleClient.InitializationRequest> request =
+            ArgumentCaptor.forClass(CustomerDimensionRuleClient.InitializationRequest.class);
+        verify(client).initialize(anyString(), request.capture());
+        assertTrue("客户-10001".equals(request.getValue().customerName()));
+        verify(repository).markReady(task, workerId(), 91L);
+    }
+
     @Test
     void transientFailureStaysPendingWithDiagnosticAndBackoff() {
         CustomerDimensionInitializationTask task = task("INITIALIZE", 0);