Add staff playtime feature, including backend services, API endpoint, and frontend integration.

WIP

database/src/main/java/com/alttd/altitudeweb/setup/Connection.java

@@ -37,6 +37,7 @@ public class Connection {
         InitializeWebDb.init();
         InitializeLiteBans.init();
         InitializeLuckPerms.init();
+        InitializeProxyPlaytime.init();
         InitializeDiscord.init();
         InitializeVotingPlugin.init();
     }