Remove the dead static_npc_mob_resists loader

AbstractCharacter.getResists fell back to Resists.getResists(0), but the
table has no ID 0, so the fallback always returned null. It now returns
the field directly. Removes dbResistHandler, the cache, the ResultSet
constructor and the empty setMobResists stub. No value change.

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

src/engine/gameManager/DbManager.java

@@ -57,7 +57,6 @@ public enum DbManager {
     public static final dbPlayerCharacterHandler PlayerCharacterQueries = new dbPlayerCharacterHandler();
     public static final dbPromotionClassHandler PromotionQueries = new dbPromotionClassHandler();
     public static final dbRaceHandler RaceQueries = new dbRaceHandler();
-    public static final dbResistHandler ResistQueries = new dbResistHandler();
     public static final dbRuneBaseHandler RuneBaseQueries = new dbRuneBaseHandler();
     public static final dbSkillBaseHandler SkillsBaseQueries = new dbSkillBaseHandler();
     public static final dbSkillReqHandler SkillReqQueries = new dbSkillReqHandler();