fix: use slim DomainListItem model for listDomains response

src/main/java/com/lettr/services/domains/model/DomainListItem.java

@@ -0,0 +1,50 @@
+package com.lettr.services.domains.model;
+
+import com.google.gson.annotations.SerializedName;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Slim view of a sending domain as returned by {@code GET /domains}.
+ * For the full detail view (DKIM/SPF/DMARC, DNS records, provider), see {@link Domain}.
+ */
+public class DomainListItem {
+
+    private String domain;
+    private String status;
+
+    @SerializedName("status_label")
+    private String statusLabel;
+
+    @SerializedName("can_send")
+    private boolean canSend;
+
+    @SerializedName("cname_status")
+    private String cnameStatus;
+
+    @SerializedName("dkim_status")
+    private String dkimStatus;
+
+    @SerializedName("created_at")
+    private String createdAt;
+
+    @SerializedName("updated_at")
+    private String updatedAt;
+
+    @Nonnull public String getDomain() { return domain; }
+    /** Status: {@code pending}, {@code approved}, or {@code blocked}. */
+    @Nonnull public String getStatus() { return status; }
+    @Nonnull public String getStatusLabel() { return statusLabel; }
+    public boolean isCanSend() { return canSend; }
+    @Nullable public String getCnameStatus() { return cnameStatus; }
+    /** DKIM status. Null until the domain has been verified at least once. */
+    @Nullable public String getDkimStatus() { return dkimStatus; }
+    @Nonnull public String getCreatedAt() { return createdAt; }
+    @Nonnull public String getUpdatedAt() { return updatedAt; }
+
+    @Override
+    public String toString() {
+        return "DomainListItem{domain='" + domain + "', status='" + status + "', canSend=" + canSend + '}';
+    }
+}

src/main/java/com/lettr/services/domains/model/ListDomainsResponse.java

@@ -8,10 +8,10 @@
  */
 public class ListDomainsResponse {
 
-    private List<Domain> domains;
+    private List<DomainListItem> domains;
 
     /** Returns the list of registered sending domains. */
-    @Nonnull public List<Domain> getDomains() { return domains; }
+    @Nonnull public List<DomainListItem> getDomains() { return domains; }
 
     @Override
     public String toString() {

src/test/java/com/lettr/services/domains/DomainsTest.java

@@ -69,11 +69,20 @@ void createDomainResponseDeserializes() {
     void listDomainsResponseDeserializes() {
         String json = "{\"domains\":[{\"domain\":\"example.com\",\"status\":\"approved\"," +
                 "\"status_label\":\"Approved\",\"can_send\":true," +
+                "\"cname_status\":\"valid\",\"dkim_status\":\"valid\"," +
                 "\"created_at\":\"2024-01-15T10:30:00+00:00\",\"updated_at\":\"2024-01-16T14:45:00+00:00\"}]}";
 
         ListDomainsResponse response = gson.fromJson(json, ListDomainsResponse.class);
         assertEquals(1, response.getDomains().size());
-        assertEquals("example.com", response.getDomains().get(0).getDomain());
+        DomainListItem item = response.getDomains().get(0);
+        assertEquals("example.com", item.getDomain());
+        assertEquals("approved", item.getStatus());
+        assertEquals("Approved", item.getStatusLabel());
+        assertTrue(item.isCanSend());
+        assertEquals("valid", item.getCnameStatus());
+        assertEquals("valid", item.getDkimStatus());
+        assertEquals("2024-01-15T10:30:00+00:00", item.getCreatedAt());
+        assertEquals("2024-01-16T14:45:00+00:00", item.getUpdatedAt());
     }
 
     @Test