Battle unit gauges extension point; battle action schemas

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locale/schema_zh.properties

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+battle/schema/builtin/battle_init = 开始战斗
+battle/schema/builtin/battle_init_desc = 来自小说场景的战斗：敌人、返回场景、任务
+battle/schema/field/enemies = 敌人
+battle/schema/field/scene = 场景
+battle/schema/field/quest = 任务
+battle/schema/field/tag = 标签
+battle/schema/builtin/set_core = 战斗核心
+battle/schema/builtin/set_core_desc = 下一场战斗遵循哪套规则
+battle/schema/field/core = 核心