feat: support SavedVariablesPerCharacter for per-character addon data

Implement the SavedVariablesPerCharacter TOC directive that many addons
use to store different settings per character (Bartender, Dominos,
MoveAnything, WeakAuras, etc.). Without this, all characters share the
same addon data file.

Per-character files are stored as <AddonName>.<CharacterName>.lua.saved
alongside the existing account-wide <AddonName>.lua.saved files. The
character name is resolved from the player GUID at world entry time.

Changes:
- TocFile::getSavedVariablesPerCharacter() parses the TOC directive
- AddonManager loads/saves per-character vars alongside account-wide vars
- Character name set from game handler before addon loading

src/core/application.cpp

@@ -5182,6 +5182,21 @@ void Application::loadOnlineWorldTerrain(uint32_t mapId, float x, float y, float
 
     // Load addons once per session on first world entry
     if (addonManager_ && !addonsLoaded_) {
+        // Set character name for per-character SavedVariables
+        if (gameHandler) {
+            const std::string& charName = gameHandler->lookupName(gameHandler->getPlayerGuid());
+            if (!charName.empty()) {
+                addonManager_->setCharacterName(charName);
+            } else {
+                // Fallback: find name from character list
+                for (const auto& c : gameHandler->getCharacters()) {
+                    if (c.guid == gameHandler->getPlayerGuid()) {
+                        addonManager_->setCharacterName(c.name);
+                        break;
+                    }
+                }
+            }
+        }
         addonManager_->loadAllAddons();
         addonsLoaded_ = true;
         addonManager_->fireEvent("VARIABLES_LOADED");