feat(web): add fan date range modes and delta column

reaction_board/web/server.py

@@ -365,6 +365,8 @@ border-color:#3a2c22;color:#f3e9dc}button{background:#e9b97c;color:#2a1a10}}
             self._send_json(HTTPStatus.OK, queries.fans(
                 _optional_int(query, "mid"),
                 days=_int_param(query, "days", 90, 1, 3650),
+                start=_optional_str(query, "start"),
+                end=_optional_str(query, "end"),
                 recent_days=_int_param(query, "recent_days", 14, 1, 3650),
             ))
             return