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/addons/toc_parser.cpp

@@ -19,17 +19,12 @@ bool TocFile::isLoadOnDemand() const {
     return (it != directives.end()) && it->second == "1";
 }
 
-std::vector<std::string> TocFile::getSavedVariables() const {
+static std::vector<std::string> parseVarList(const std::string& val) {
     std::vector<std::string> result;
-    auto it = directives.find("SavedVariables");
-    if (it == directives.end()) return result;
-    // Parse comma-separated variable names
-    std::string val = it->second;
     size_t pos = 0;
     while (pos <= val.size()) {
         size_t comma = val.find(',', pos);
         std::string name = (comma != std::string::npos) ? val.substr(pos, comma - pos) : val.substr(pos);
-        // Trim whitespace
         size_t start = name.find_first_not_of(" \t");
         size_t end = name.find_last_not_of(" \t");
         if (start != std::string::npos)
@@ -40,6 +35,16 @@ std::vector<std::string> TocFile::getSavedVariables() const {
     return result;
 }
 
+std::vector<std::string> TocFile::getSavedVariables() const {
+    auto it = directives.find("SavedVariables");
+    return (it != directives.end()) ? parseVarList(it->second) : std::vector<std::string>{};
+}
+
+std::vector<std::string> TocFile::getSavedVariablesPerCharacter() const {
+    auto it = directives.find("SavedVariablesPerCharacter");
+    return (it != directives.end()) ? parseVarList(it->second) : std::vector<std::string>{};
+}
+
 std::optional<TocFile> parseTocFile(const std::string& tocPath) {
     std::ifstream f(tocPath);
     if (!f.is_open()) return std::nullopt;