feat: track and display WotLK server-authoritative combat stats

Adds update field tracking for WotLK secondary combat statistics:
- UNIT_FIELD_ATTACK_POWER / RANGED_ATTACK_POWER (fields 123, 126)
- PLAYER_DODGE/PARRY/BLOCK/CRIT_PERCENTAGE (fields 1025-1029)
- PLAYER_RANGED_CRIT_PERCENTAGE, PLAYER_SPELL_CRIT_PERCENTAGE1 (1030, 1032)
- PLAYER_FIELD_COMBAT_RATING_1 (25 slots at 1231, hit/expertise/haste/etc.)

Both CREATE_OBJECT and VALUES update paths now populate these fields.
The Character screen Stats tab shows them when received from the server,
with graceful fallback when not available (Classic/TBC expansions).

Field indices verified against AzerothCore 3.3.5a UpdateFields.h.

Data/expansions/wotlk/update_fields.json

@@ -23,6 +23,8 @@
   "UNIT_FIELD_STAT3": 87,
   "UNIT_FIELD_STAT4": 88,
   "UNIT_END": 148,
+  "UNIT_FIELD_ATTACK_POWER": 123,
+  "UNIT_FIELD_RANGED_ATTACK_POWER": 126,
   "PLAYER_FLAGS": 150,
   "PLAYER_BYTES": 153,
   "PLAYER_BYTES_2": 154,
@@ -38,6 +40,13 @@
   "PLAYER_SKILL_INFO_START": 636,
   "PLAYER_EXPLORED_ZONES_START": 1041,
   "PLAYER_CHOSEN_TITLE": 1349,
+  "PLAYER_BLOCK_PERCENTAGE": 1024,
+  "PLAYER_DODGE_PERCENTAGE": 1025,
+  "PLAYER_PARRY_PERCENTAGE": 1026,
+  "PLAYER_CRIT_PERCENTAGE": 1029,
+  "PLAYER_RANGED_CRIT_PERCENTAGE": 1030,
+  "PLAYER_SPELL_CRIT_PERCENTAGE1": 1032,
+  "PLAYER_FIELD_COMBAT_RATING_1": 1231,
   "GAMEOBJECT_DISPLAYID": 8,
   "ITEM_FIELD_STACK_COUNT": 14,
   "ITEM_FIELD_DURABILITY": 60,