refactor: extract updateTimers() from GameHandler::update()

Move 164 lines of timer/pending-state logic into updateTimers():
auction delay, quest accept timeouts, money delta, GO loot retries,
name query resync, loot money notifications, auto-inspect throttling.
update() is now ~430 lines (down from original 704).

include/game/game_handler.hpp

@@ -2315,6 +2315,7 @@ public:
      */
     void update(float deltaTime);
     void updateNetworking(float deltaTime);
+    void updateTimers(float deltaTime);
 
     /**
      * Reset DBC-backed caches so they reload from new expansion data.