fix(channel): accept snake_case event request fields from channel-service

backend/mci-server/src/main/java/com/sino/mci/channel/dto/ChannelAccountEventRequest.java

@@ -1,5 +1,6 @@
 package com.sino.mci.channel.dto;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import lombok.Data;
@@ -10,17 +11,22 @@ import java.util.Map;
 public class ChannelAccountEventRequest {
 
     @NotBlank
+    @JsonProperty("event_id")
     private String eventId;
 
     @NotBlank
+    @JsonProperty("event_type")
     private String eventType;
 
     @NotBlank
+    @JsonProperty("account_id")
     private String accountId;
 
     @NotBlank
+    @JsonProperty("tenant_code")
     private String tenantCode;
 
+    @JsonProperty("timestamp")
     private String timestamp;
 
     @NotNull