feat: add GetNumAddOns and GetAddOnInfo for addon introspection

- GetNumAddOns() — returns count of loaded addons
- GetAddOnInfo(indexOrName) — returns name, title, notes, loadable

Addon info is stored in the Lua registry from the .toc directives
and populated before addon files execute. Useful for addon managers
and compatibility checks between addons.

Total WoW API: 33 functions.

include/addons/lua_engine.hpp

@@ -9,6 +9,8 @@ namespace wowee::game { class GameHandler; }
 
 namespace wowee::addons {
 
+struct TocFile;  // forward declaration
+
 class LuaEngine {
 public:
     LuaEngine();
@@ -39,6 +41,9 @@ public:
     bool loadSavedVariables(const std::string& path);
     bool saveSavedVariables(const std::string& path, const std::vector<std::string>& varNames);
 
+    // Store addon info in registry for GetAddOnInfo/GetNumAddOns
+    void setAddonList(const std::vector<TocFile>& addons);
+
     lua_State* getState() { return L_; }
     bool isInitialized() const { return L_ != nullptr; }