Make city bell tolls mark real server time like actual clock towers

Changed bell tolls from random intervals to proper timekeeping mechanism:

How it works:
- Bells now toll at the top of every hour (minute == 0)
- Number of tolls indicates the hour in 12-hour format:
  * 1 AM/PM = 1 toll
  * 2 AM/PM = 2 tolls
  * 12 AM/PM = 12 tolls
- 1.5 second delay between individual tolls
- Uses system time (server time for single-player mode)

Technical details:
- Detects hour changes via std::chrono and localtime()
- Tracks lastHourTolled_ to prevent duplicate tolling
- remainingTolls_ counter for sequential toll playback
- bellTollDelay_ for 1.5s spacing between tolls
- Only tolls when currentCity_ is set (in a city)
- Resets bell state when changing cities
- Converts 24-hour to 12-hour format (0 and 12 both become 12)

Example: At 3:00 PM in Stormwind, the Alliance bell will toll 3 times
with 1.5s between each toll, marking the hour like a real clock tower.

This makes bells actually useful for tracking real time while playing!

include/audio/ambient_sound_manager.hpp

@@ -174,7 +174,9 @@ private:
     float oceanLoopTime_ = 0.0f;
     float zoneLoopTime_ = 0.0f;
     float cityLoopTime_ = 0.0f;
-    float bellTollTime_ = 0.0f;
+    float bellTollDelay_ = 0.0f;  // Delay between individual bell tolls
+    int lastHourTolled_ = -1;  // Track last hour we tolled for
+    int remainingTolls_ = 0;  // Number of tolls left to play
     bool wasIndoor_ = false;
     bool wasBlacksmith_ = false;
     bool wasSwimming_ = false;