refactor: reorganize networking and data bridge scenes

* Move networking scenes under `controllers/networking`
* Move data bridge scene under `scenes/data`
* Rename the bridge node to `data_bridge`
* Update lobby UI scene path
* Remove unused lobby RPC node/script

scenes/data/game_data.gd

@@ -0,0 +1,58 @@
+class_name GameData extends Node
+
+
+var client1: int
+var client2: int
+var player_id: String    = ""
+
+var game_address: String = "0.0.0.0"
+var game_port: int       = 8080
+var game_mode: String    = "freeball"
+
+enum PlayerType {
+	Player1,
+	Player2
+}
+
+enum GameModeType {
+	BALL_8,
+	BALL_9,
+	SNOOKER,
+	FREE_BALL
+}
+
+const MATCH_TYPES: Dictionary = {
+	"8ball": GameModeType.BALL_8,
+	"9ball": GameModeType.BALL_9,
+	"snooker": GameModeType.SNOOKER,
+	"freeball": GameModeType.FREE_BALL
+}
+
+var GameMode: Dictionary = {
+	GameModeType.BALL_8: Ball8,
+	GameModeType.BALL_9: Ball9,
+	GameModeType.SNOOKER: Snooker,
+	GameModeType.FREE_BALL: FreeBall
+}
+
+var SelectedGameMode: GameModeType = GameModeType.FREE_BALL
+
+
+func _init() -> void:
+	Globals.game_data = self
+
+
+@rpc("authority", "reliable")
+func set_game_address(address: String) -> void:
+	game_address = address
+
+@rpc("authority", "reliable")
+func set_game_port(port: String) -> void:
+	game_port = int(port)
+
+
+func set_game_mode(mode: String) -> void:
+	SelectedGameMode = MATCH_TYPES[mode]
+
+func set_player_id(is_player_1: bool) -> void:
+	player_id = "Player 1" if is_player_1 else "Player 2"