要塞分支不再攻击空中单位；莫斯提马的减速显示状态图标 (#48)

要塞分支（灰毫 chess_char_2_18、号角 chess_char_5_08，普通与精锐）按官方不能攻击空中单位：build-data 不再把 fortress 归为可对空，重新生成 data/chess.json（只改这 4 条记录的 canHitFly），DESIGN §21.29 的技能释放调整保持不变。莫斯提马天赋的减速补上可见的减速状态图标（减速本身 0.1.1 已生效）。fix #35

tools/build-data.mjs

@@ -709,8 +709,8 @@ function classifyAttack(char, traitText) {
   if (attackKind === 'heal') projectile = 'orb';
   else if (attackKind === 'ranged') projectile = dmgType === 'arts' ? 'bolt' : 'arrow';
 
-  // Ranged attackers hit FLY unless the trait restricts them to ground targets (投掷手 "地面敌人").
-  const canHitFly = (attackKind === 'ranged' && !/地面敌人/.test(trait)) || sub === 'skywalker';
+  // Ranged attackers hit FLY unless the trait restricts them to ground targets (投掷手 "地面敌人", 要塞).
+  const canHitFly = (attackKind === 'ranged' && !/地面敌人/.test(trait) && sub !== 'fortress') || sub === 'skywalker';
   let targetPriority = null;
   if (/优先攻击空中单位/.test(trait)) targetPriority = 'fly';
   else if (/防御力最低/.test(trait)) targetPriority = 'lowestDef';