Fix sitting in chairs

proto/EvtAvatarLockChairReq.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "Vector.proto";
+
+message EvtAvatarLockChairReq {
+	enum CmdId {
+		option allow_alias = true;
+		ENET_CHANNEL_ID = 0;
+		NONE = 0;
+		ENET_IS_RELIABLE = 1;
+		IS_ALLOW_CLIENT = 1;
+		CMD_ID = 341;
+	}
+
+	uint64 chair_id = 1;
+	Vector position = 2;
+}