feat: add boards and tasks management endpoints

backend/app/schemas/__init__.py

@@ -0,0 +1,20 @@
+from app.schemas.activity_events import ActivityEventRead
+from app.schemas.agents import AgentCreate, AgentRead, AgentUpdate
+from app.schemas.boards import BoardCreate, BoardRead, BoardUpdate
+from app.schemas.tasks import TaskCreate, TaskRead, TaskUpdate
+from app.schemas.users import UserCreate, UserRead
+
+__all__ = [
+    "ActivityEventRead",
+    "AgentCreate",
+    "AgentRead",
+    "AgentUpdate",
+    "BoardCreate",
+    "BoardRead",
+    "BoardUpdate",
+    "TaskCreate",
+    "TaskRead",
+    "TaskUpdate",
+    "UserCreate",
+    "UserRead",
+]