Add width parameter to thumbnail endpoint for flexible size handling

application/src/main/java/run/halo/app/core/endpoint/theme/ThumbnailEndpoint.java

@@ -20,12 +20,12 @@ import run.halo.app.core.attachment.ThumbnailService;
 import run.halo.app.core.attachment.ThumbnailSize;
 import run.halo.app.core.extension.endpoint.CustomEndpoint;
 import run.halo.app.extension.GroupVersion;
-import run.halo.app.extension.ReactiveExtensionClient;
 
 /**
  * Thumbnail endpoint for thumbnail resource access.
  *
  * @author guqing
+ * @author johnniang
  * @since 2.19.0
  */
 @Component
@@ -34,8 +34,6 @@ public class ThumbnailEndpoint implements CustomEndpoint {
 
     private final ThumbnailService thumbnailService;
 
-    private final ReactiveExtensionClient client;
-
     @Override
     public RouterFunction<ServerResponse> endpoint() {
         var tag = "ThumbnailV1alpha1Public";
@@ -57,7 +55,17 @@ public class ThumbnailEndpoint implements CustomEndpoint {
                         .implementation(ThumbnailSize.class)
                         .description("The size of the thumbnail")
                         .required(true)
-                    );
+                    )
+                    .parameter(parameterBuilder()
+                        .in(ParameterIn.QUERY)
+                        .name("width")
+                        .description("""
+                            The width of the thumbnail, if 'size' is not provided, this \
+                            parameter will be used to determine the size\
+                            """)
+                        .required(false)
+                    )
+                ;
             })
             .build();
     }