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。

tasks/serializers.py

@@ -0,0 +1,69 @@
+from rest_framework import serializers
+from .models import Task, TaskApplication, TaskInvitation, DeliveryRecord
+
+class DeliveryRecordSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = DeliveryRecord
+        fields = '__all__'
+
+class TaskApplicationSerializer(serializers.ModelSerializer):
+    applicant_name = serializers.ReadOnlyField(source='applicant.nickname')
+    applicant_username = serializers.ReadOnlyField(source='applicant.username')
+    applicant_avatar = serializers.ReadOnlyField(source='applicant.avatar_url')
+    applicant_rating = serializers.ReadOnlyField(source='applicant.rating')
+    applicant_completed_tasks = serializers.ReadOnlyField(source='applicant.completed_tasks')
+    task_detail = serializers.SerializerMethodField()
+    is_invited = serializers.SerializerMethodField()
+    delivery_records = DeliveryRecordSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = TaskApplication
+        fields = '__all__'
+        read_only_fields = ['id', 'applicant', 'status', 'reviewed_by', 'reviewed_at', 'created_at', 'updated_at']
+
+    def get_task_detail(self, obj):
+        return {
+            'id': obj.task.id,
+            'title': obj.task.title,
+            'budget_min': obj.task.budget_min,
+            'budget_max': obj.task.budget_max,
+            'status': obj.task.status,
+        }
+
+    def get_is_invited(self, obj):
+        from .models import TaskInvitation
+        return TaskInvitation.objects.filter(task=obj.task, expert=obj.applicant).exists()
+
+
+class TaskInvitationSerializer(serializers.ModelSerializer):
+    enterprise_name = serializers.ReadOnlyField(source='task.enterprise.company_name')
+    enterprise_logo = serializers.ReadOnlyField(source='task.enterprise.logo_url')
+    enterprise_avatar = serializers.ReadOnlyField(source='task.publisher.avatar_url')
+    inviter_name = serializers.ReadOnlyField(source='task.publisher.nickname')
+    enterprise_phone = serializers.ReadOnlyField(source='task.publisher.phone')
+    task_title = serializers.ReadOnlyField(source='task.title')
+    expert_name = serializers.ReadOnlyField(source='expert.nickname')
+    expert_avatar = serializers.ReadOnlyField(source='expert.avatar_url')
+    expert_phone = serializers.ReadOnlyField(source='expert.phone')
+
+    
+    class Meta:
+        model = TaskInvitation
+        fields = '__all__'
+        read_only_fields = ['id', 'created_at', 'updated_at']
+
+
+class TaskSerializer(serializers.ModelSerializer):
+    applications = TaskApplicationSerializer(many=True, read_only=True)
+    invitations = TaskInvitationSerializer(many=True, read_only=True)
+    publisher_name = serializers.ReadOnlyField(source='publisher.nickname')
+    publisher_avatar = serializers.ReadOnlyField(source='publisher.avatar_url')
+    publisher_phone = serializers.ReadOnlyField(source='publisher.phone')
+    enterprise_name = serializers.ReadOnlyField(source='enterprise.company_name')
+    enterprise_logo = serializers.ReadOnlyField(source='enterprise.logo_url')
+
+    class Meta:
+        model = Task
+        fields = '__all__'
+        read_only_fields = ['id', 'publisher', 'enterprise', 'created_at', 'updated_at', 'assigned_at', 'completed_at', 'cancelled_at']
+