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

config/game/Server.properties

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+# 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 = .*

config/game/hexid.txt

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+# HexID = RequestServerID 1 (должен совпадать с gameservers.hexid в БД)
+HexID=a1b2c3d4e5f6789012345678901234ef
+ServerID=1

config/game/ipconfig.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<list xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../data/xsd/ipconfig.xsd">
+	<host subnet="0.0.0.0/0" address="127.0.0.1" />
+</list>