refactor(sync): drop favorite-folder tracking and deal

reaction_board/config.py

@@ -68,8 +68,6 @@ DEFAULT_CONFIG: dict[str, Any] = {
     "up_blacklist_seed": [],
     "schedule": {
         "discover_minutes": 60,
-        "folder_sync_minutes": 60,
-        "full_folder_refresh_hours": 6,
         "snapshot_at": "00:01",
         "candidate_ttl_days": 7,
     },
@@ -151,8 +149,6 @@ class FolderConfig:
 @dataclass(frozen=True)
 class ScheduleConfig:
     discover_minutes: int
-    folder_sync_minutes: int
-    full_folder_refresh_hours: int
     snapshot_at: str
     candidate_ttl_days: int
 
@@ -370,16 +366,6 @@ def _build_config(data: Mapping[str, Any], path: Path) -> AppConfig:
         discover_minutes=_as_int(
             sched_raw.get("discover_minutes", 60), "schedule.discover_minutes", minimum=1
         ),
-        folder_sync_minutes=_as_int(
-            sched_raw.get("folder_sync_minutes", 60),
-            "schedule.folder_sync_minutes",
-            minimum=1,
-        ),
-        full_folder_refresh_hours=_as_int(
-            sched_raw.get("full_folder_refresh_hours", 6),
-            "schedule.full_folder_refresh_hours",
-            minimum=1,
-        ),
         snapshot_at=snapshot_at,
         candidate_ttl_days=_as_int(
             sched_raw.get("candidate_ttl_days", 7),