feat: implement multiplayer networking improvements for reduced latency

Major networking enhancements to improve multiplayer performance and
reduce desync issues in games like Mario Kart 8 Deluxe:

Network Performance:
- Add socket connection pooling in BSD service to reduce overhead
- Implement unreliable packet delivery for latency-sensitive game data
- Add packet reliability control for both ProxyPacket and LDNPacket
- Use ENET_PACKET_FLAG_UNSEQUENCED for small UDP packets (<1200 bytes)

Monitoring & Debugging:
- Add PacketStatistics struct to track sent/received/dropped packets
- Enhanced logging for proxy packet handling and socket lifecycle
- Periodic stats logging every 100 packets for diagnostics

Configuration:
- Update lobby_api_url and web_api_url to https://api.ynet-fun.xyz
- Add lobby API URL configuration support

Socket Management:
- Implement SocketPoolKey for efficient socket reuse
- Store domain/type/protocol info in FileDescriptor
- Max pool size limit (8 sockets per type) to prevent memory bloat
- Return closed sockets to pool when room is still connected

Protocol Updates:
- Add 'reliable' field to ProxyPacket and LDNPacket structures
- Update room.cpp packet handlers to respect reliability flags
- Maintain backward compatibility with default reliable=true

These changes significantly reduce packet latency for real-time game
traffic while maintaining reliability for control packets.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/common/settings.h

@@ -661,10 +661,12 @@ struct Values {
     // Network
     Setting<std::string> network_interface{linkage, std::string(), "network_interface",
                                            Category::Network};
+    Setting<std::string> lobby_api_url{linkage, "https://api.ynet-fun.xyz", "lobby_api_url",
+                                       Category::Network};
 
     // WebService
     Setting<bool> enable_telemetry{linkage, false, "enable_telemetry", Category::WebService};
-    Setting<std::string> web_api_url{linkage, "http://api.ynet-fun.xyz", "web_api_url",
+    Setting<std::string> web_api_url{linkage, "https://api.ynet-fun.xyz", "web_api_url",
                                      Category::WebService};
     Setting<std::string> citron_username{linkage, std::string(), "citron_username",
                                        Category::WebService};