feat: add board goals, memory, approvals, onboarding models

backend/app/models/__init__.py

@@ -1,15 +1,23 @@
 from app.models.activity_events import ActivityEvent
 from app.models.agents import Agent
+from app.models.approvals import Approval
+from app.models.board_memory import BoardMemory
+from app.models.board_onboarding import BoardOnboardingSession
 from app.models.boards import Board
 from app.models.gateways import Gateway
 from app.models.tasks import Task
+from app.models.task_fingerprints import TaskFingerprint
 from app.models.users import User
 
 __all__ = [
     "ActivityEvent",
     "Agent",
+    "Approval",
+    "BoardMemory",
+    "BoardOnboardingSession",
     "Board",
     "Gateway",
     "Task",
+    "TaskFingerprint",
     "User",
 ]