feat: 新增光标刃轮武器及相关资源

添加光标刃轮武器系统，包括：
- 武器脚本和场景配置
- 子弹动画和特效
- 相关音效和贴图资源
- 武器升级逻辑
- 角色初始武器配置调整

scripts/Contents/Weapons/CursorKnife.gd

@@ -0,0 +1,18 @@
+@tool
+extends Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 2 * to * soulLevel
+	origin["speed"] += 0.004 * to * soulLevel
+	return origin
+func attack(entity: EntityBase):
+	attackSpeed = 1 + readStore("speed")
+	for bullet in BulletBase.generate(
+		ComponentManager.getBullet("CursorKnife"),
+		entity,
+		get_global_mouse_position(),
+		entity.position.angle_to_point(get_global_mouse_position())
+	):
+		if bullet is CursorKnifeBullet:
+			bullet.baseDamage = readStore("atk")
+	return true

scripts/Contents/Weapons/CursorKnife.gd.uid

@@ -0,0 +1 @@
+uid://jyalew2bgcnk