feat: local browser saves with opt-in cloud sync behind saves.cloud permission

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

backend/app/routers/versions.py

@@ -268,7 +268,9 @@ async def delete_version(version_id: int, user: CurrentUser, db: DB) -> None:
     remove_upload(version_id)
 
 
-# --- saves -----------------------------------------------------------------
+# --- cloud saves -----------------------------------------------------------
+# Saves live in the browser by default; these endpoints are the opt-in cloud copy.
+CloudSaves = Annotated[User, Depends(require("games.play", "saves.cloud"))]
 
 def _check_slot(slot: str) -> str:
     if not slot or len(slot) > 32 or not all(c.isalnum() or c in "_-" for c in slot):
@@ -277,7 +279,7 @@ def _check_slot(slot: str) -> str:
 
 
 @router.get("/versions/{version_id}/saves", response_model=list[SaveOut])
-async def list_saves(version_id: int, user: Player, db: DB) -> list[Save]:
+async def list_saves(version_id: int, user: CloudSaves, db: DB) -> list[Save]:
     await get_version(db, user, version_id)
     return list((await db.scalars(
         select(Save).where(Save.user_id == user.id, Save.version_id == version_id)
@@ -291,7 +293,7 @@ async def _find_save(db: DB, user: User, version_id: int, slot: str) -> Save | N
 
 
 @router.get("/versions/{version_id}/saves/{slot}", response_model=SaveDetailOut)
-async def get_save(version_id: int, slot: str, user: Player, db: DB) -> Save:
+async def get_save(version_id: int, slot: str, user: CloudSaves, db: DB) -> Save:
     save = await _find_save(db, user, version_id, slot)
     if not save:
         raise HTTPException(status.HTTP_404_NOT_FOUND, "Сохранение не найдено")
@@ -299,7 +301,7 @@ async def get_save(version_id: int, slot: str, user: Player, db: DB) -> Save:
 
 
 @router.put("/versions/{version_id}/saves/{slot}", response_model=SaveOut)
-async def put_save(version_id: int, slot: str, body: SaveIn, user: Player, db: DB) -> Save:
+async def put_save(version_id: int, slot: str, body: SaveIn, user: CloudSaves, db: DB) -> Save:
     await get_version(db, user, version_id)
     save = await _find_save(db, user, version_id, slot)
     if save is None:
@@ -315,7 +317,7 @@ async def put_save(version_id: int, slot: str, body: SaveIn, user: Player, db: D
 
 
 @router.delete("/versions/{version_id}/saves/{slot}", status_code=204)
-async def delete_save(version_id: int, slot: str, user: Player, db: DB) -> None:
+async def delete_save(version_id: int, slot: str, user: CloudSaves, db: DB) -> None:
     save = await _find_save(db, user, version_id, slot)
     if save:
         await db.delete(save)