- Add a new `EntriesRead` / `entries_read` hook for extensions.
- Trigger the hook when `markRead()` changes entry read/unread state for explicit entry IDs.
- Cover both the default DAO path and the SQLite/PGSQL DAO path.
- Add Minz hook tests for the new hook signature and argument passing.
## Why
Extensions can already react to favorite/bookmark changes through `EntriesFavorite`. This adds the matching read/unread hook requested in #4051 for extensions that need to collect stats or react to manual read state changes.
Closes#4051
310bcb5e90