feat: 口粮消耗与饥饿减半（[food] 配置驱动）

src/Core/GameConfig.gd

@@ -56,6 +56,14 @@ var building_params: Dictionary = {
 	"field": {"cost": 100, "output": 5, "upgrade_cost_x": 2.0, "upgrade_output_x": 1.5},
 }
 
+# —— 口粮与生存（对应 cfg 的 [food] 节）——
+## 练气弟子人均日消耗灵米。
+var food_consumption_per_disciple := 1
+## 饥饿期间修炼速度倍率。
+var hunger_speed_multiplier := 0.5
+## 断粮累计天数上限（达到即离宗）。
+var hunger_threshold_days := 30
+
 ## 各难度资质权重表（键 = 难度档位，值 = 下品/中品/上品/天骄 权重）。
 var aptitude_weights_by_difficulty: Dictionary = {
 	"normal": [45, 35, 15, 5],
@@ -121,6 +129,10 @@ func _load_config() -> void:
 			"upgrade_cost_x": cfg.get_value("building_" + key, "upgrade_cost_x", p["upgrade_cost_x"]),
 			"upgrade_output_x": cfg.get_value("building_" + key, "upgrade_output_x", p["upgrade_output_x"]),
 		}
+	# 口粮与生存
+	food_consumption_per_disciple = cfg.get_value("food", "consumption_per_disciple", food_consumption_per_disciple)
+	hunger_speed_multiplier = cfg.get_value("food", "hunger_speed_multiplier", hunger_speed_multiplier)
+	hunger_threshold_days = cfg.get_value("food", "hunger_threshold_days", hunger_threshold_days)
 	var apt_raw: Variant = cfg.get_value("cultivation", "aptitude_speed", [])
 	if apt_raw is Array and apt_raw.size() == aptitude_speed.size():
 		var arr: Array[float] = []