fix(hero): adjust default hero movement speed from 100 to 200

将英雄默认移动速度从100修改为200，调整基础战斗体验参数

assets/script/game/hero/Hero.ts

@@ -156,7 +156,7 @@ export class Hero extends ecs.Entity {
             model.hp = model.hp_max = base_hp;
         }
 
-        model.speed = hero.speed ?? 100;
+        model.speed = hero.speed ?? 200;
 
         // 构建技能表并注入运行时冷却字段 ccd
         model.skills = {};