feat: 1. 添加武器基础脚本

2. 添加武器基本resources
3. 武器碰撞 RangeArea 进入和退出检测
4. 添加 Hitbox 进行武器碰撞敌人区域（只是添加了，功能还没实现）
5. 武器冷却时间 weapon_base / CooldownTimer

scenes/weapons/weapon_base.tscn

@@ -0,0 +1,29 @@
+[gd_scene format=3 uid="uid://dcc7rsdy4j8v6"]
+
+[ext_resource type="Script" uid="uid://d2fxp4oky50qs" path="res://scenes/weapons/weapon.gd" id="1_v4xn6"]
+[ext_resource type="Texture2D" uid="uid://l5hst1cf27oo" path="res://assets/sprites/Weapons/Melee/Weapon_Punch.png" id="2_uvw4m"]
+
+[sub_resource type="CircleShape2D" id="CircleShape2D_vffjk"]
+radius = 150.0
+
+[node name="WeaponBase" type="Node2D" unique_id=63743776]
+script = ExtResource("1_v4xn6")
+
+[node name="Sprite2D" type="Sprite2D" parent="." unique_id=1011668514]
+scale = Vector2(0.5, 0.5)
+texture = ExtResource("2_uvw4m")
+
+[node name="RangeArea" type="Area2D" parent="." unique_id=877203105]
+collision_mask = 2
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="RangeArea" unique_id=902525969]
+unique_name_in_owner = true
+shape = SubResource("CircleShape2D_vffjk")
+
+[node name="CooldownTimer" type="Timer" parent="." unique_id=1814049304]
+one_shot = true
+
+[node name="WeaponBehavior" type="Node2D" parent="." unique_id=1507497844]
+
+[connection signal="area_entered" from="RangeArea" to="." method="_on_range_area_area_entered"]
+[connection signal="area_exited" from="RangeArea" to="." method="_on_range_area_area_exited"]