Fix armor stat in character stats panel via UNIT_FIELD_RESISTANCES

The character stats panel was showing Armor: 0 because summing armor
from item query responses is fragile (depends on correct BuyCount/damage
block parsing). Instead, read the server-authoritative total armor
directly from UNIT_FIELD_RESISTANCES (physical resistance, index 0)
in the player entity update fields.

Added UNIT_FIELD_RESISTANCES to the UF enum and all four expansion
JSON files with correct wire indices:
  WotLK 3.3.5a: 99   (NPC_FLAGS=82 + emotestate + stat×5 + posstat×5 + negstat×5)
  TBC 2.4.3:   185   (NPC_FLAGS=168 + same relative layout)
  Classic 1.12: 154  (NPC_FLAGS=147 + emotestate + stat×5, no posstat/negstat)
  Turtle WoW:  154   (same as Classic)

Stats panel uses server armor when > 0, falls back to summed item-query
armor otherwise. Armor rating resets to 0 on world entry and is updated
from both CREATE_OBJECT and VALUES update blocks.

Data/expansions/turtle/update_fields.json

@@ -15,6 +15,7 @@
   "UNIT_FIELD_AURAS": 50,
   "UNIT_NPC_FLAGS": 147,
   "UNIT_DYNAMIC_FLAGS": 143,
+  "UNIT_FIELD_RESISTANCES": 154,
   "UNIT_END": 188,
   "PLAYER_FLAGS": 190,
   "PLAYER_BYTES": 191,