feat: 增加欢迎板

- 增加欢迎板场景
- 增加与玩家的交互，点击E弹出弹出框

scenes/prefabs/items/WelcomeBoard.gd

@@ -0,0 +1,13 @@
+extends StaticBody2D
+
+func interact():
+	# Prevent multiple dialogs
+	if get_tree().root.has_node("WelcomeDialog"):
+		return null
+		
+	# Spawn the Welcome Dialog
+	var dialog = preload("res://scenes/ui/welcome_dialog.tscn").instantiate()
+	dialog.name = "WelcomeDialog"
+	# Add to the Scene Root (World) or CanvasLayer if it has one
+	get_tree().root.add_child(dialog)
+	return null # Return null prevents Player from showing a bubble

scenes/prefabs/items/WelcomeBoard.gd.uid

@@ -0,0 +1 @@
+uid://d2od22agputjt

scenes/prefabs/items/welcome_board.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://c7k8yay002w4"]
+
+[ext_resource type="Script" uid="uid://ceg3xogmd82yx" path="res://scenes/prefabs/items/WelcomeBoard.gd" id="1_script"]
+[ext_resource type="Texture2D" uid="uid://v7loa3smfkrd" path="res://Assets/materials/WelcomeBoard.png" id="2_sprite"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_board"]
+size = Vector2(40, 30)
+
+[node name="WelcomeBoard" type="StaticBody2D"]
+collision_layer = 3
+script = ExtResource("1_script")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+texture = ExtResource("2_sprite")
+scale = Vector2(0.25, 0.25)
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+position = Vector2(0, 10)
+shape = SubResource("RectangleShape2D_board")