feat: resolve title names from CharTitles.dbc in SMSG_TITLE_EARNED

Previously SMSG_TITLE_EARNED only showed the numeric bit index.
Now it lazy-loads CharTitles.dbc and formats the full title string
with the player's name (e.g. "Title earned: Commander Kelsi!").

- Add CharTitles layout to WotLK (TitleBit=36) and TBC (TitleBit=20) layouts
- loadTitleNameCache() maps each titleBit to its English title string
- SMSG_TITLE_EARNED substitutes %s placeholder with local player's name
- Falls back to "Title earned (bit N)!" if DBC is unavailable

Data/expansions/tbc/dbc_layouts.json

@@ -31,6 +31,7 @@
     "ReputationBase0": 10, "ReputationBase1": 11,
     "ReputationBase2": 12, "ReputationBase3": 13
   },
+  "CharTitles": { "ID": 0, "Title": 2, "TitleBit": 20 },
   "AreaTable": { "ID": 0, "MapID": 1, "ParentAreaNum": 2, "ExploreFlag": 3 },
   "CreatureDisplayInfoExtra": {
     "ID": 0, "RaceID": 1, "SexID": 2, "SkinID": 3, "FaceID": 4,

Data/expansions/wotlk/dbc_layouts.json

@@ -31,6 +31,7 @@
     "ReputationBase0": 10, "ReputationBase1": 11,
     "ReputationBase2": 12, "ReputationBase3": 13
   },
+  "CharTitles": { "ID": 0, "Title": 2, "TitleBit": 36 },
   "Achievement": { "ID": 0, "Title": 4, "Description": 21, "Points": 39 },
   "AchievementCriteria": { "ID": 0, "AchievementID": 1, "Quantity": 4, "Description": 9 },
   "AreaTable": { "ID": 0, "MapID": 1, "ParentAreaNum": 2, "ExploreFlag": 3 },