fix(rabbitmq): 修复Spring Boot启动时objectMapper bean冲突

- 取消了RabbitMQConfig中通过方法参数注入ObjectMapper，避免重复定义bean
- 在messageConverter方法内新建ObjectMapper实例，独立配置序列化选项
- 在application.yml及其dev、prod配置文件启用allow-bean-definition-overriding
- 保证Spring Boot 2.5.15环境中bean定义覆盖正常，解决启动失败问题
- 修复后确保MQ消息队列和扫码登录功能正常运行

src/main/java/com/gxwebsoft/common/mq/config/RabbitMQConfig.java

@@ -1,5 +1,6 @@
 package com.gxwebsoft.common.mq.config;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
@@ -67,15 +68,13 @@ public class RabbitMQConfig {
     // ==================== Message Converter ====================
 
     @Bean
-    public ObjectMapper objectMapper() {
+    public MessageConverter messageConverter() {
+        // 使用JacksonConfig中定义的@Primary objectMapper bean
         ObjectMapper objectMapper = new ObjectMapper();
         objectMapper.registerModule(new JavaTimeModule());
         objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
-        return objectMapper;
-    }
-
-    @Bean
-    public MessageConverter messageConverter(ObjectMapper objectMapper) {
+        objectMapper.disable(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS);
+        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
         return new Jackson2JsonMessageConverter(objectMapper);
     }