feat: add is_chat field to board memory and task_id to approvals, update pagination and response models

backend/app/schemas/view_models.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from sqlmodel import SQLModel
+
+from app.schemas.agents import AgentRead
+from app.schemas.approvals import ApprovalRead
+from app.schemas.board_memory import BoardMemoryRead
+from app.schemas.boards import BoardRead
+from app.schemas.tasks import TaskRead
+
+
+class TaskCardRead(TaskRead):
+    assignee: str | None = None
+    approvals_count: int = 0
+    approvals_pending_count: int = 0
+
+
+class BoardSnapshot(SQLModel):
+    board: BoardRead
+    tasks: list[TaskCardRead]
+    agents: list[AgentRead]
+    approvals: list[ApprovalRead]
+    chat_messages: list[BoardMemoryRead]
+    pending_approvals_count: int = 0