move proto to submodule

proto/ChatInfo.proto

@@ -2,17 +2,26 @@ syntax = "proto3";
 
 option java_package = "emu.grasscutter.net.proto";
 
-import "SystemHint.proto";
 
 message ChatInfo {
+	enum SystemHintType {
+		CHAT_NONE = 0;
+		CHAT_ENTER_WORLD = 1;
+		CHAT_LEAVE_WORLD = 2;
+	}
+
+	message SystemHint {
+		uint32 type = 1;
+	}
+
+	oneof Content {
+		string text = 100;
+		uint32 icon = 101;
+		SystemHint system_hint = 102;
+	}
 	uint32 time = 1;
 	uint32 uid = 2;
 	uint32 sequence = 3;
-	uint32 toUid = 4;
-	bool isRead = 5;
-	oneof content {
-		string text = 100;
-		uint32 icon = 101;
-		SystemHint systemHint = 102;
-	}
+	uint32 to_uid = 4;
+	bool is_read = 5;
 }