[feat] Add client_id support to task queue system

- Add client_id field to QueueTaskItem and TaskHistoryItem models
- Implement client-specific WebSocket message routing
- Add client filtering to queue status and history endpoints
- Follow ComfyUI patterns for session management
- Create data_models package for better code organization

comfyui_manager/data_models/task_queue.py

@@ -0,0 +1,69 @@
+"""
+Task queue data models for ComfyUI Manager.
+
+Contains Pydantic models for task queue management, WebSocket messaging,
+and task state tracking.
+"""
+
+from typing import Optional, Union, Dict
+from enum import Enum
+from pydantic import BaseModel
+
+
+class QueueTaskItem(BaseModel):
+    """Represents a task item in the queue."""
+
+    ui_id: str
+    client_id: str
+    kind: str
+
+
+class TaskHistoryItem(BaseModel):
+    """Represents a completed task in the history."""
+
+    ui_id: str
+    client_id: str
+    kind: str
+    timestamp: str
+    result: str
+    status: Optional[dict] = None
+
+
+class TaskStateMessage(BaseModel):
+    """Current state of the task queue system."""
+
+    history: Dict[str, TaskHistoryItem]
+    running_queue: list[QueueTaskItem]
+    pending_queue: list[QueueTaskItem]
+
+
+class MessageTaskDone(BaseModel):
+    """WebSocket message sent when a task completes."""
+
+    ui_id: str
+    result: str
+    kind: str
+    status: Optional[dict]
+    timestamp: str
+    state: TaskStateMessage
+
+
+class MessageTaskStarted(BaseModel):
+    """WebSocket message sent when a task starts."""
+
+    ui_id: str
+    kind: str
+    timestamp: str
+    state: TaskStateMessage
+
+
+# Union type for all possible WebSocket message updates
+MessageUpdate = Union[MessageTaskDone, MessageTaskStarted]
+
+
+class ManagerMessageName(Enum):
+    """WebSocket message type constants."""
+
+    TASK_DONE = "cm-task-completed"
+    TASK_STARTED = "cm-task-started"
+    STATUS = "cm-queue-status"