feat: create message capture policies

backend/src/api/routers/folders.py

@@ -0,0 +1,36 @@
+from typing import Annotated
+
+import asyncpg
+from dishka.integrations.fastapi import FromDishka, inject
+from fastapi import APIRouter, Query
+
+from utils.policy import repository
+from utils.policy.models import FolderSpec
+
+router = APIRouter(prefix="/api/folders", tags=["folders"])
+
+
+def _serialize(spec: FolderSpec) -> dict:
+    return {
+        "folder_id": spec.folder_id,
+        "order_index": spec.order_index,
+        "title": spec.title,
+        "include_ids": sorted(spec.include_ids),
+        "exclude_ids": sorted(spec.exclude_ids),
+        "pinned_ids": sorted(spec.pinned_ids),
+        "contacts": spec.contacts,
+        "non_contacts": spec.non_contacts,
+        "groups": spec.groups,
+        "broadcasts": spec.broadcasts,
+        "bots": spec.bots,
+        "is_chatlist": spec.is_chatlist,
+    }
+
+
+@router.get("")
+@inject
+async def list_folders(
+    pool: FromDishka[asyncpg.Pool], account_id: Annotated[int, Query()]
+) -> list[dict]:
+    folders = await repository.list_folders(pool, account_id)
+    return [_serialize(spec) for spec in folders]