fix(gateway): use BodyInserter supertype — Spring 6.2 renamed FormDataSpec to FormInserter

backend/api-gateway/src/main/java/com/deepdata/gateway/infrastructure/casdoor/CasdoorClient.java

@@ -6,6 +6,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.MediaType;
 import org.springframework.http.client.reactive.ReactorClientHttpConnector;
 import org.springframework.stereotype.Component;
+import org.springframework.web.reactive.function.BodyInserter;
 import org.springframework.web.reactive.function.BodyInserters;
 import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.WebClient;
@@ -104,7 +105,7 @@ public class CasdoorClient {
      * 非 2xx 解析错误 JSON 并抛出带 error_description 的异常。
      */
     private Mono<CasdoorTokenResponse> postToken(
-            BodyInserters.FormDataSpec form, String op) {
+            BodyInserter<?, ?> form, String op) {
         return webClient.post()
                 .uri(props.getTokenUri())
                 .contentType(MediaType.APPLICATION_FORM_URLENCODED)