feat(武器系统): 添加七魂武器及相关资源

添加七魂武器系统，包括：
- 七魂武器脚本和场景
- 灵魂子弹脚本和场景
- 相关图片资源和音效
- 修改公鸡角色的武器配置
- 修复子弹基础类的UI状态检测问题

scripts/Contents/Bullets/SevenSoul.gd

@@ -0,0 +1,25 @@
+extends BulletBase
+
+var colors = [
+	"#2BEAFF",
+	"#FCA500",
+	"#0042FF",
+	"#D346D0",
+	"#0C9B0B",
+	"#FDEB0F"
+]
+var index = 0
+
+@onready var heart = $"%heart"
+
+func spawn():
+	heart.modulate = Color(colors[index % colors.size()])
+	rotation_degrees = 360.0 / colors.size() * index
+func ai():
+	rotation_degrees += 1.5
+	heart.global_rotation_degrees = 0
+	PresetBulletAI.lockLauncher(self, launcher, true)
+func applyDot():
+	BulletBase.generate(ComponentManager.getBullet("SoulBall"), launcher, heart.global_position, heart.global_position.angle_to_point(get_global_mouse_position()))
+	await TickTool.millseconds(100)
+	return true

scripts/Contents/Bullets/SoulBall.gd

@@ -0,0 +1,4 @@
+extends BulletBase
+
+func ai():
+	PresetBulletAI.forward(self, rotation)

scripts/Contents/Weapons/SevenSoul.gd

@@ -0,0 +1,10 @@
+@tool
+extends Weapon
+
+func attack(entity: EntityBase):
+	for i in 7:
+		for j in BulletBase.generate(ComponentManager.getBullet("SevenSoul"), entity, entity.texture.global_position, 0):
+			j.index = i
+func update(to, origin, _entity):
+	origin["atk"] += 1 * to * soulLevel
+	return origin