feat(多人游戏): 实现多人游戏状态同步和单机/多人模式切换

添加多人游戏状态管理，包括连接状态和玩家名称同步
修改WorldManager和EntityBase以支持多人游戏逻辑
在Starter面板中实现单机和多人游戏启动功能

scripts/Statemachine/EntityBase.gd

@@ -105,6 +105,7 @@ var currentStage: int = 0
 var spawnTime: float = 0
 
 func _ready():
+	multiplayer.multiplayer_peer = MultiplayerState.connection
 	if useStatic:
 		texture = texture.get_node("staticAnimation")
 	spawnTime = WorldManager.getTime()
@@ -170,7 +171,7 @@ func _physics_process(_delta: float) -> void:
 		velocity = Vector2.ZERO
 		if (isPlayer() or is_instance_valid(currentFocusedBoss)) and not charginup and canRunAi:
 			if isPlayer():
-				if MultiplayerState.playerName == displayName:
+				if MultiplayerState.playerName == displayName or not MultiplayerState.isMultiplayer:
 					ai()
 			else:
 				ai()
@@ -180,6 +181,13 @@ func _physics_process(_delta: float) -> void:
 	storeEnergy(randf_range(0.01, 0.05 + fields.get(FieldStore.Entity.ENERGY_REGENERATION) - 1), true)
 	trailParticle.emitting = trailing
 
+# 同步状态
+@rpc("any_peer")
+func syncPosition(player: String, newPosition: Vector2, newVelocity: Vector2):
+	if player != displayName: return
+	position = newPosition
+	velocity = newVelocity
+
 # 通用方法
 func rebuildWeaponIcons():
 	if isPlayer():
@@ -216,6 +224,9 @@ func move(direction: Vector2, isSprinting: bool = false):
 	var currentDirection = sign(direction.x)
 	if currentDirection != 0:
 		lastDirection = currentDirection
+	if MultiplayerState.isMultiplayer:
+		print("test")
+		syncPosition.rpc(displayName, position, velocity)
 func getSprintInitialDisplace():
 	return displace(velocity) * sprintMultiplier
 func getSprintProgress():
@@ -437,6 +448,7 @@ func kill():
 static func generatePlayer(playerName: String):
 	var player = generate(ComponentManager.getCharacter("Rooster"), Vector2.ZERO, false, false, true)
 	player.displayName = playerName
+	player.name = "Player_%s" % playerName
 	return player
 static func generate(
 	entity: PackedScene,