feat(pipeline): add WLFG (Wowee Looking-for-Group) catalog

57th open format — replaces LFGDungeons.dbc plus the
AzerothCore-style dungeon-finder reward tables. Defines the
dungeons / raids that the Dungeon Finder / Raid Browser
presents to players, with their level brackets, group-size
requirements, role requirements (tank / heal / DPS), and
queue-completion rewards.

4 difficulty levels (Normal / Heroic / Mythic / Hardmode —
the latter for Ulduar-style toggleable boss difficulty),
4 expansion gates (Classic / TBC / WotLK / TurtleWoW), and
3 role-requirement bits (Tank / Heal / DPS — typically all
three for queue-formed groups).

Cross-references with prior formats — mapId points at
WMS.mapId (the instance map), queueRewardItemId points at
WIT.itemId (the random reward bag), firstClearAchievement
points at WACH.achievementId.

CLI: --gen-lfg (3 classic 5-mans Ragefire/Wailing/Deadmines
with real WoW mapIds + level brackets), --gen-lfg-heroic
(5 WotLK 80-level heroic 5-mans with emblem rewards +
real first-clear achievement IDs from Halls of Lightning
through Old Kingdom), --gen-lfg-raid (3 raid entries —
Naxx-25, Ulduar-25 Hardmode, ToC-25 Mythic), --info-wlfg,
--validate-wlfg with --json variants. Validator catches
id+name+mapId required, difficulty 0..3, expansion 0..3,
minLevel<=maxLevel, recommended-level outside range
warning, unusual groupSize warning (5/10/25/40 are
canonical), and zero role mask (queue can't form a
balanced group).

Format graph: 56 → 57 binary formats. CLI flag count: 804
→ 811.

tools/editor/cli_arg_required.cpp

@@ -172,6 +172,8 @@ const char* const kArgRequired[] = {
     "--gen-sch", "--gen-sch-magical", "--gen-sch-combined",
     "--info-wsch", "--validate-wsch",
     "--export-wsch-json", "--import-wsch-json",
+    "--gen-lfg", "--gen-lfg-heroic", "--gen-lfg-raid",
+    "--info-wlfg", "--validate-wlfg",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",