feat: add organization-related models and update schemas for organization management

backend/app/models/__init__.py

@@ -7,6 +7,11 @@ 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.organization_board_access import OrganizationBoardAccess
+from app.models.organization_invite_board_access import OrganizationInviteBoardAccess
+from app.models.organization_invites import OrganizationInvite
+from app.models.organization_members import OrganizationMember
+from app.models.organizations import Organization
 from app.models.task_dependencies import TaskDependency
 from app.models.task_fingerprints import TaskFingerprint
 from app.models.tasks import Task
@@ -22,6 +27,11 @@ __all__ = [
     "BoardGroup",
     "Board",
     "Gateway",
+    "Organization",
+    "OrganizationMember",
+    "OrganizationBoardAccess",
+    "OrganizationInvite",
+    "OrganizationInviteBoardAccess",
     "TaskDependency",
     "Task",
     "TaskFingerprint",