feat(agent): add input variable validation

api/app/schemas/api_key_schema.py

@@ -155,8 +155,7 @@ class ApiKey(BaseModel):
         return datetime.datetime.now() > self.expires_at
 
     @field_serializer('expires_at', 'last_used_at', 'created_at', 'updated_at')
-    @classmethod
-    def serialize_datetime(cls, v: Optional[datetime.datetime]) -> Optional[int]:
+    def serialize_datetime(self, v: Optional[datetime.datetime]) -> Optional[int]:
         """将datetime转换为时间戳"""
         return datetime_to_timestamp(v)
 
@@ -171,8 +170,7 @@ class ApiKeyStats(BaseModel):
     avg_response_time: Optional[float] = Field(None, description="平均响应时间（毫秒）")
 
     @field_serializer('last_used_at')
-    @classmethod
-    def serialize_datetime(cls, v: Optional[datetime.datetime]) -> Optional[int]:
+    def serialize_datetime(self, v: Optional[datetime.datetime]) -> Optional[int]:
         """将datetime转换为时间戳"""
         return datetime_to_timestamp(v)
 
@@ -219,7 +217,6 @@ class ApiKeyLog(BaseModel):
     created_at: datetime.datetime
 
     @field_serializer('created_at')
-    @classmethod
-    def serialize_datetime(cls, v: datetime.datetime) -> int:
+    def serialize_datetime(self, v: datetime.datetime) -> int:
         """将datetime转换为时间戳"""
         return datetime_to_timestamp(v)

api/app/schemas/multi_agent_schema.py

@@ -64,14 +64,14 @@ class ExecutionConfig(BaseModel):
 class MultiAgentConfigCreate(BaseModel):
     """创建多 Agent 配置"""
     master_agent_id: uuid.UUID = Field(..., description="主 Agent ID")
-    master_agent_name: Optional[str] = Field(None, max_length=100, description="主 Agent 名称")
+    master_agent_name: Optional[str] = Field(default=None, max_length=100, description="主 Agent 名称")
     orchestration_mode: str = Field(
         default="collaboration",
         pattern="^(collaboration|supervisor)$",
         description="协作模式：collaboration（协作）| supervisor（监督）"
     )
     sub_agents: List[SubAgentConfig] = Field(..., description="子 Agent 列表")
-    routing_rules: Optional[List[RoutingRule]] = Field(None, description="路由规则")
+    routing_rules: Optional[List[RoutingRule]] = Field(default=None, description="路由规则")
     execution_config: ExecutionConfig = Field(default_factory=ExecutionConfig, description="执行配置")
     aggregation_strategy: str = Field(
         default="merge",
@@ -83,7 +83,7 @@ class MultiAgentConfigCreate(BaseModel):
 class MultiAgentConfigUpdate(BaseModel):
     """更新多 Agent 配置"""
     master_agent_id: Optional[uuid.UUID] = None
-    master_agent_name: Optional[str] = Field(None, max_length=100, description="主 Agent 名称")
+    master_agent_name: Optional[str] = Field(default=None, max_length=100, description="主 Agent 名称")
     default_model_config_id: Optional[uuid.UUID] = Field(None, description="默认模型配置ID")
     model_parameters: Optional[ModelParameters] = Field(
         None,