Add server broadcasts, fake client, timestamps

Enable transform broadcast testing and time syncing: server now assigns incrementing player IDs, sends a welcome packet with playerId and serverTime, and appends serverTime/playerId to incoming transform packets before broadcasting them to all other connected clients. Added thread-safe client tracking, send_packet helper, client removal on send errors, and improved logging. Plugin now includes a clientTime timestamp in transform packets. Added server/fake_client.py to receive and print welcome and broadcasted transform packets, and updated server README and dev-log with usage and test notes.

plugin/src/F4TNetworking.cpp

@@ -148,6 +148,8 @@ namespace F4T::Networking
 
 		g_socket = localSocket;
 		REX::INFO("Connected to Fallout 4 Together local server.");
+		// TODO: Read and log the server welcome packet once the plugin has a small
+		// non-blocking receive path. For now the server owns player IDs entirely.
 		return true;
 	}
 
@@ -181,16 +183,20 @@ namespace F4T::Networking
 			return false;
 		}
 
+		const auto clientTime =
+			std::chrono::duration<double>(std::chrono::system_clock::now().time_since_epoch()).count();
+
 		std::array<char, 320> packet{};
 		auto packetSize = std::snprintf(
 			packet.data(),
 			packet.size(),
-			"{\"type\":\"transform\",\"x\":%.2f,\"y\":%.2f,\"z\":%.2f,\"angleZ\":%.2f,\"movementType\":\"%s\"",
+			"{\"type\":\"transform\",\"x\":%.2f,\"y\":%.2f,\"z\":%.2f,\"angleZ\":%.2f,\"movementType\":\"%s\",\"clientTime\":%.3f",
 			a_x,
 			a_y,
 			a_z,
 			a_angleZ,
-			a_movementType ? a_movementType : "normal");
+			a_movementType ? a_movementType : "normal",
+			clientTime);
 
 		if (packetSize <= 0 || static_cast<std::size_t>(packetSize) >= packet.size()) {
 			REX::WARN("Could not format Fallout 4 Together transform packet.");