feat: add board goal schemas and validation

backend/app/schemas/board_memory.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from datetime import datetime
+from uuid import UUID
+
+from sqlmodel import SQLModel
+
+
+class BoardMemoryCreate(SQLModel):
+    content: str
+    tags: list[str] | None = None
+    source: str | None = None
+
+
+class BoardMemoryRead(BoardMemoryCreate):
+    id: UUID
+    board_id: UUID
+    created_at: datetime