fix: 修复MySQL连接编码为utf8mb4并添加Jackson配置

backend/src/main/resources/application.yml

@@ -6,9 +6,9 @@ server:
 spring:
   application:
     name: oms-backend
-  
+
   datasource:
-    url: jdbc:mysql://localhost:3306/oms?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false
+    url: jdbc:mysql://localhost:3306/oms?useUnicode=true&characterEncoding=utf8mb4&serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true
     username: root
     password: root
     driver-class-name: com.mysql.cj.jdbc.Driver
@@ -39,6 +39,12 @@ spring:
     redis:
       time-to-live: 3600000
 
+  jackson:
+    date-format: yyyy-MM-dd'T'HH:mm:ss
+    time-zone: Asia/Shanghai
+    serialization:
+      write-dates-as-timestamps: false
+
 mybatis-plus:
   mapper-locations: classpath*:/mapper/**/*.xml
   type-aliases-package: com.oms.entity