refactor(资源管理): 集中资源加载逻辑到ComponentManager

将分散在各处的资源加载逻辑统一到ComponentManager中管理
添加对UI组件、主题、物品纹理和饲料的集中管理
移除SkillIconBase.tscn并迁移到UI目录

scripts/Statemachine/DamageLabel.gd

@@ -33,7 +33,7 @@ func _ready():
 	queue_free()
 
 static func create(spawnDamage: float, spawnCrit: bool, spawnPosition: Vector2, addToWorld: bool = true) -> DamageLabel:
-	var instance = load("res://components/UI/DamageLabel.tscn").instantiate()
+	var instance = ComponentManager.getUIComponent("DamageLabel").instantiate()
 	instance.damage = spawnDamage
 	instance.crit = spawnCrit
 	instance.position = spawnPosition

scripts/Statemachine/EntityBase.gd

@@ -126,7 +126,7 @@ func _ready():
 					UIState.energyPercent.setCurrent(newEnergy)
 		)
 		for i in weapons:
-			var icon: SkillIcon = load("res://components/Abstracts/SkillIconBase.tscn").instantiate()
+			var icon: SkillIcon = ComponentManager.getUIComponent("SkillIcon").instantiate()
 			icon.weapon = i
 			UIState.skillIconContainer.add_child(icon)
 	else:

scripts/Statemachine/FieldShow.gd

@@ -37,7 +37,7 @@ func _ready():
 		valueLabel.label_settings.font_color = Color(1, 1, 1)
 
 static func create(newField: FieldStore.Entity, newValue: float, newShowSign: bool, newEntity: EntityBase, newUseViewCast: bool) -> FieldShow:
-	var fieldShow = load("res://components/UI/FieldShow.tscn").instantiate()
+	var fieldShow = ComponentManager.getUIComponent("FieldShow").instantiate()
 	fieldShow.field = newField
 	fieldShow.value = newValue
 	fieldShow.showSign = newShowSign

scripts/Statemachine/ItemDropped.gd

@@ -50,7 +50,7 @@ static func generate(
 		spawnPosition: Vector2,
 		addToWorld: bool = true
 	):
-	var instance: ItemDropped = load("res://components/UI/ItemDropped.tscn").instantiate()
+	var instance: ItemDropped = ComponentManager.getUIComponent("ItemDropped").instantiate()
 	instance.item = itemType
 	instance.stackCount = count
 	instance.position = spawnPosition

scripts/Statemachine/ItemShow.gd

@@ -23,7 +23,7 @@ func _physics_process(_delta):
 	countLabel.text = str(count)
 
 static func generate(itemType: ItemStore.ItemType, itemCount: int = 1, isAutoFree: bool = false):
-	var item = load("res://components/UI/ItemShow.tscn").instantiate()
+	var item = ComponentManager.getUIComponent("ItemShow").instantiate()
 	item.type = itemType
 	item.count = itemCount
 	item.autoFree = isAutoFree