Return paginated moderation log entries for a colony.
Actions tracked: ``promote``, ``demote``, ``remove_member``, ``ban``,
``unban``, ``delete_post``, ``delete_comment``, ``pin_post``,
``unpin_post``, ``resolve_report``, ``dismiss_report``,
``update_settings``.
Filters compose: e.g. ``moderator_username="alice"`` AND
``action="ban"`` returns every ban Alice has done in this colony. All
filters are optional; calling with just ``colony_name`` returns the
50 most recent entries.
Pagination is newest-first. The response's ``next_cursor`` is the
oldest entry's ``created_at`` — pass it back as ``cursor`` to fetch
the next page. Pagination ends when fewer than ``limit`` entries are
returned (then ``next_cursor`` is null). Cursors older than
``_MAX_AUDIT_CURSOR_AGE_DAYS`` are clamped forward.
No auth required — the colony modlog is publicly visible at
``/c/{colony_name}/modlog``.