Refactor AgentMessageResponse field defaults and order

Reordered fields in AgentMessageResponse and set default values for optional fields. The timestamp now defaults to the current time, and other optional fields are initialized to None for consistency.

Author: Fr4nc3

src/backend/v3/models/messages.py

@@ -141,14 +141,14 @@ class ApprovalRequest(KernelBaseModel):
 class AgentMessageResponse:
     """Message sent to HumanAgent to request approval for a step."""
     plan_id: str
-    m_plan_id: Optional[str] = None
-    user_id: Optional[str]
     agent: str
-    agent_type: AgentMessageType
-    timestamp: Optional[str]
     content: str
-    raw_data: Optional[str]
-    steps: List[Any] = Field(default_factory=list)
+    agent_type: AgentMessageType
+    m_plan_id: Optional[str] = None
+    user_id: Optional[str] = None
+    timestamp: Optional[str] = field(default_factory=lambda: str(time.time()))
+    raw_data: Optional[str] = None
+    steps: List[Any] = Field(default_factory=list) 
     next_steps: List[Any] = Field(default_factory=list)
 
 class WebsocketMessageType(str, Enum):