Show server status to three-party game launcher

src/main/java/emu/grasscutter/server/dispatch/DispatchServer.java

@@ -4,6 +4,7 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.protobuf.ByteString;
 
+import emu.grasscutter.GameConstants;
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.Grasscutter.ServerDebugMode;
 import emu.grasscutter.Grasscutter.ServerRunMode;
@@ -258,6 +259,15 @@ public final class DispatchServer {
 		httpServer.post("/authentication/register", (req, res) -> this.getAuthHandler().handleRegister(req, res));
 		httpServer.post("/authentication/change_password", (req, res) -> this.getAuthHandler().handleChangePassword(req, res));
 
+		// Server Status
+		httpServer.get("/status/server", (req, res) -> {
+
+			int playerCount = Grasscutter.getGameServer().getPlayers().size();
+			String version = GameConstants.VERSION;
+
+			res.send("{\"retcode\":0,\"status\":{\"playerCount\":" + playerCount + ",\"version\":\"" + version + "\"}}");
+		});
+
 		// Dispatch
 		httpServer.get("/query_region_list", (req, res) -> {
 			// Log