Add ambient sound system and eliminate log spam

- Implement AmbientSoundManager with tavern/outdoor ambience
- Fix audio buffer limit (5s → 60s) for long ambient loops
- Set log level to INFO to eliminate DEBUG spam (130MB → 3.2MB logs)
- Remove excessive terrain/model/network logging
- Fix ambient sound timer sharing and pitch parameter bugs

src/main.cpp

@@ -31,7 +31,7 @@ int main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[]) {
     std::signal(SIGTERM, crashHandler);
     std::signal(SIGINT,  crashHandler);
     try {
-        wowee::core::Logger::getInstance().setLogLevel(wowee::core::LogLevel::DEBUG);
+        wowee::core::Logger::getInstance().setLogLevel(wowee::core::LogLevel::INFO);
         LOG_INFO("=== Wowee Native Client ===");
         LOG_INFO("Starting application...");