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

docker/initdb/03_seed_essence520.sql

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+-- Тестовые данные: Essence protocol 520 (логин + регистрация GS).
+-- Логины: admin/admin, test/test
+-- Hexid совпадает с server/hexid/default.txt
+
+INSERT INTO global_data (var, value)
+VALUES ('essence_protocol', '520')
+ON CONFLICT (var) DO UPDATE SET value = EXCLUDED.value;
+
+INSERT INTO accounts (login, password, lastactive, "accessLevel", "lastIP", "lastServer")
+VALUES
+  (
+    'admin',
+    '0DPiKuNIrrVmD8IUCuw1hQxNqZc=',
+    (EXTRACT(EPOCH FROM NOW()) * 1000)::bigint,
+    100,
+    '127.0.0.1',
+    1
+  ),
+  (
+    'test',
+    'qUqP5cyxm6YcTAhz05Hph5gvu9M=',
+    (EXTRACT(EPOCH FROM NOW()) * 1000)::bigint,
+    0,
+    '127.0.0.1',
+    1
+  )
+ON CONFLICT (login) DO NOTHING;
+
+-- RequestServerID = 1, hex из server/hexid/default.txt
+INSERT INTO gameservers (server_id, hexid, host)
+VALUES (1, 'a1b2c3d4e5f6789012345678901234ef', '127.0.0.1')
+ON CONFLICT (server_id) DO UPDATE
+  SET hexid = EXCLUDED.hexid, host = EXCLUDED.host;