Add Essence 520 minimal DB, configs, and login/game Docker profile.

config/game/Server.properties

@@ -0,0 +1,24 @@
+# Lineage 2 Essence — Game Server (шаблон, клиент protocol 520)
+# Скопируйте в dist/game/config/ вашей сборки.
+
+LoginHost = login
+LoginPort = 9014
+GameserverHostname = *
+GameserverPort = 7777
+
+RequestServerID = 1
+AcceptAlternateID = True
+MaximumOnlineUsers = 500
+DatapackRoot = .
+
+# Только клиент 520 (Essence)
+AllowedProtocolRevisions = 520
+
+Driver = org.postgresql.Driver
+URL = jdbc:postgresql://postgres:5432/l2essence
+Login = l2user
+Password = change_me_strong_password
+MaximumDbConnections = 100
+
+CharMaxNumber = 7
+CnameTemplate = .*