CoA: mirror RAID_CLASS_COLORS for the 21 custom classes

Vanilla Altoholic hardcodes a 10-entry ChatColor table keyed by the
englishClass tokens MAGE/WARRIOR/.../DEATHKNIGHT. On the CoA Voljin/PTR
realm UnitClass / GetGuildRosterInfo return tokens like BARBARIAN,
WITCHDOCTOR, CHRONOMANCER, … so the lookup falls through:

  * Altoholic:GetClassColor (Altoholic.lua:580) returns WHITE for all
    21 CoA classes via the `or WHITE` fallback — guild/character/
    profession panes lose their per-class colours.
  * DataStore_Characters._GetColoredCharacterName had no fallback at
    all — `ClassColors[englishClass] .. character.name` hard-crashed
    on nil-concat for any CoA-class character.
  * Altoholic.lua:710 read CLASS_ICON_TCOORDS[class] for the character
    portrait without a fallback; CoA classes aren't in the vanilla
    sprite sheet's coord table, so the next line `tc[1]` crashed.

Fix follows the established Exiles addon-port pattern (see
coa-omen/CoAClassColors.lua, coa-shadowedunitframes/.../CoAClassColors.lua,
coa-kui-nameplates/.../CoAClassColors.lua): mirror _G.RAID_CLASS_COLORS
into the addon's private table at load. The CoA client itself ships
the realm-authoritative 32-token palette (10 vanilla + HERO + 21 CoA)
in Interface/SharedXML/SharedConstants.lua inside patch-B.MPQ, which
populates RAID_CLASS_COLORS at FrameXML load time — see
db.exil.es /coa/dev for the full table.

- Altoholic/CoAClassColors.lua: new file, mirrors source palette into
  Altoholic.ClassInfo as "|cFFRRGGBB" ChatColor escapes. Never
  overwrites — preserves the addon's vanilla defaults and any future
  user overrides.
- Altoholic/Altoholic.xml: loads CoAClassColors.lua after Altoholic.lua
  so Altoholic.ClassInfo exists.
- Altoholic/Altoholic.lua: defensive CLASS_ICON_TCOORDS lookup with
  WARRIOR fallback (wrong icon beats crash; CoA character creation
  uses its own sprite sheet which doesn't extend the vanilla table).
- DataStore_Characters/DataStore_Characters.lua: inline mirror after
  the local ClassColors table (can't be touched from a sibling file
  because the table is file-local), plus `or WHITE` defensive fallback
  in _GetColoredCharacterName and _GetClassColor.

Does not touch DataStore_Talents — CoA's MoA system uses
C_CharacterAdvancement, not GetNumTalentTabs/GetTalentInfo, so that
module needs a full API rewrite rather than a data patch.

Altoholic-Addon/DataStore_Characters/DataStore_Characters.lua

@@ -129,26 +129,52 @@ local function _GetCharacterClass(character)
 	return character.class or "", character.englishClass or ""
 end
 
+local WHITE = "|cFFFFFFFF"
+
 local ClassColors = {
 	["MAGE"] = "|cFF69CCF0",
 	["WARRIOR"] = "|cFFC79C6E",
 	["HUNTER"] = "|cFFABD473",
 	["ROGUE"] = "|cFFFFF569",
-	["WARLOCK"] = "|cFF9482CA", 
-	["DRUID"] = "|cFFFF7D0A", 
+	["WARLOCK"] = "|cFF9482CA",
+	["DRUID"] = "|cFFFF7D0A",
 	["SHAMAN"] = "|cFF2459FF",
-	["PALADIN"] = "|cFFF58CBA", 
-	["PRIEST"] = "|cFFFFFFFF",
+	["PALADIN"] = "|cFFF58CBA",
+	["PRIEST"] = WHITE,
 	["DEATHKNIGHT"] = "|cFFC41F3B"
 }
 
-local function _GetColoredCharacterName(character)
-	return ClassColors[character.englishClass] .. character.name
+-- CoA: mirror _G.RAID_CLASS_COLORS (10 vanilla + HERO + 21 CoA tokens on
+-- the Voljin/PTR realm) into ClassColors so guild/character rows for
+-- BARBARIAN, WITCHDOCTOR, CHRONOMANCER, … render with the
+-- realm-canonical palette instead of nil-concat-crashing in
+-- _GetColoredCharacterName below. Source of truth is the client's
+-- Interface/SharedXML/SharedConstants.lua; same pattern as
+-- coa-omen/CoAClassColors.lua and the Altoholic UI's CoAClassColors.lua.
+do
+	local source = _G.RAID_CLASS_COLORS
+	if type(source) == "table" then
+		for token, color in pairs(source) do
+			if ClassColors[token] == nil and type(color) == "table" then
+				local r, g, b
+				if color.GetRGB then r, g, b = color:GetRGB()
+				else r, g, b = color.r, color.g, color.b end
+				if r and g and b then
+					ClassColors[token] = string.format("|cFF%02X%02X%02X",
+						r * 255 + 0.5, g * 255 + 0.5, b * 255 + 0.5)
+				end
+			end
+		end
+	end
 end
-	
+
+local function _GetColoredCharacterName(character)
+	return (ClassColors[character.englishClass] or WHITE) .. character.name
+end
+
 local function _GetClassColor(character)
 	-- return just the color of this character's class
-	return ClassColors[character.englishClass]
+	return ClassColors[character.englishClass] or WHITE
 end
 
 local function _GetCharacterFaction(character)