Drop the server-made mobbase rows and the dead mobbase columns

The 406 ID <> loadID mobbases (15000-17266) were junk: no RUNE file, nothing
on dev references them. MobBase now always reads its core fields from the
race rune and logs an error if the rune is missing; the loader skips any
ID <> loadID rows still present. GetClassType only matched those IDs, so it
always returned 2518 and is replaced by the constant.

DB: MBDATA/JSON-Refactor-Plan/sql/3.6-mobbase-cleanup.sql deletes the rows,
the 10 orphan static_npc_mobbase_effects rows (17061/17122/17154) and drops
13 columns no longer read: lootTableID, name, level, health, atr, defense,
minDmg, maxDmg, noaggro, raceType, fsm, notEnemy, enemy.

Value changes: none for the 2375 loaded mobbases.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/Mob.java

@@ -181,7 +181,7 @@ public class Mob extends AbstractIntelligenceAgent implements Delayed {
             serializeRune(mob, writer, 5, GameObjectType.NPCClassRuneTwo.ordinal(), 252621); //guard rune
         } else if (mob.contract != null || mob.isPlayerGuard()) {
             writer.putInt(3);
-            serializeRune(mob, writer, 3, GameObjectType.NPCClassRuneTwo.ordinal(), MobBase.GetClassType(mob.getMobBaseID())); //warrior class
+            serializeRune(mob, writer, 3, GameObjectType.NPCClassRuneTwo.ordinal(), 2518); //warrior class
             serializeRune(mob, writer, 5, GameObjectType.NPCClassRuneThree.ordinal(), 252621); //guard rune
         } else
             writer.putInt(1);