feat: align with new platform registration notification

src/main/java/io/github/webbasedwodt/application/presenter/api/PlatformRegistration.java

@@ -25,14 +25,20 @@
  */
 public final class PlatformRegistration {
     private final String self;
+    private final String dtUri;
 
     /**
      * Default constructor.
      * @param self the field where the WoDT Platform send its URL
+     * @param dtUri the uri of this dt, that has been registered
      */
     @JsonCreator
-    public PlatformRegistration(@JsonProperty("self") final String self) {
+    public PlatformRegistration(
+        @JsonProperty("self") final String self,
+        @JsonProperty("dtUri") final String dtUri
+    ) {
         this.self = self;
+        this.dtUri = dtUri;
     }
 
     /**
@@ -42,4 +48,12 @@ public PlatformRegistration(@JsonProperty("self") final String self) {
     public String getSelf() {
         return this.self;
     }
+
+    /**
+     * Obtain the dtUri of the registered DT.
+     * @return the dt uri
+     */
+    public String getDtUri() {
+        return this.dtUri;
+    }
 }