feat: HUD 重构与主题资源——灵米显示、新布局、标签描边阴影、按钮/菜单主题

src/Core/SectManager.gd

@@ -3,9 +3,11 @@ extends Node
 
 signal spirit_stones_changed(new_value: int, delta: int)
 signal reputation_changed(new_value: int, delta: int)
+signal food_changed(new_value: int, delta: int)
 
 var spirit_stones := 0      # 灵石
 var reputation := 0         # 声望
+var food := 0               # 灵米（食物资源，HUD 显示"灵米"）
 
 
 func add_spirit_stones(amount: int) -> void:
@@ -23,3 +25,11 @@ func add_reputation(amount: int) -> void:
 func remove_reputation(amount: int) -> void:
 	reputation -= amount
 	emit_signal("reputation_changed", reputation, -amount)
+
+func add_food(amount: int) -> void:
+	food += amount
+	emit_signal("food_changed", food, amount)
+
+func remove_food(amount: int) -> void:
+	food -= amount
+	emit_signal("food_changed", food, -amount)