开发了多角色登录与鉴权接口：实现了普通用户、企业和管理员的登录分流，并支持Token验证。

开发了权限控制接口：实现了通过数据库分配菜单权限节点，控制接口访问安全。
开发了实名认证中心：实现了个人身份证信息与企业营业执照的提交与审核接口。
开发了任务与协作大厅核心业务：实现了任务的发布、接单、状态流转以及专家邀约接口。
配置了全局环境变量与数据库引擎：集成了 PostgreSQL 数据库、Redis 缓存与 MinIO 对象存储。

system/serializers.py

@@ -0,0 +1,36 @@
+from rest_framework import serializers
+from .models import Announcement, Notification, SystemConfig, AiModel, ModelToken, Skill
+
+class AnnouncementSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Announcement
+        fields = '__all__'
+
+class NotificationSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Notification
+        fields = '__all__'
+        read_only_fields = ['id', 'user', 'created_at']
+
+class SystemConfigSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = SystemConfig
+        fields = '__all__'
+
+class AiModelSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AiModel
+        fields = '__all__'
+
+class ModelTokenSerializer(serializers.ModelSerializer):
+    model_name = serializers.ReadOnlyField(source='model.name')
+    class Meta:
+        model = ModelToken
+        fields = '__all__'
+        read_only_fields = ['id', 'user', 'token_value', 'created_at']
+
+class SkillSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Skill
+        fields = '__all__'
+        read_only_fields = ['id', 'created_at', 'updated_at']