feedback1f WT: 蒂比's 起飞 is 对地规避 — ground enemies no longer target or hit her while airborne

Official: ba.liftoff 起飞 "不阻挡地面敌人且不会被地面敌人攻击，可以阻挡飞行敌人"; PRTS 术语释义 起飞 "包含对地规避（无法被不同
阵营行动方式为地面的单位选中）… 起飞后单位的行动方式依旧是地面"; PRTS 异常效果 MOTION_TARGET_FREE; PRTS 行动方式 "起飞的干员仍然
是地面单位".

Cause: 起飞 was `unit.ground = false` (an operator on a high tile). Melee enemies were released, but every ranged
ground enemy kept shooting her and the AoE / skills of ground enemies hit her (控潮术师 6 hits in one S2 window).

Now 起飞 is the skill buff flag `liftoff`:
- targeting.js evadesGround: no ground enemy (not Unit.isFlying) selects her (canTargetAlly; the content picks that
  bypass it: 周围四格 additions, chain / bounce jumps, the 自行炮 shells); flyers, 近地悬浮 and 浮空 enemies still do.
- damage.js / Battle.applyStatus: a ground enemy's damage, element fill and statuses never land on her (area damage,
  shots under way); sourceless damage and `ignoreSelect` zones (【污染秽蚀】 "可对空，无视无法选择") still do.
- Battle._blockerFor: she blocks no ground enemy; flyers at the air radius as before.
- She stays a ground unit on her low tile: 污染秽蚀 at the low rate, 隐德来希 S2 can put a 血镰 on her (可对空).

server/sim/content/bosses.js

@@ -58,7 +58,7 @@
 //   'sword' 'vest' 'blink' 'summon' 'grow' 'phase' 'lpLoss' (x, y + extra {id, r, tiles, kind, tx, ty …}).
 
 import { MOVE_SCALE } from '../constants.js';
-import { canTargetAlly, aggroCmp } from '../targeting.js';
+import { canTargetAlly, aggroCmp, evadesGround } from '../targeting.js';
 import { compileRoute } from '../ai.js';
 import { normalizeRoute } from '../simdata.js';
 import {
@@ -687,7 +687,7 @@ function kitSpring(ab, e) {
             b.fx('beam', { x: e2.x, y: e2.y, from: e2.id, to: t.id, kind: 'springBullet' });
             elem(b, e2, t, 'erosion', e2.s.atk * ratio * Math.pow(SPRING_BOUNCE_FALLOFF, k));
             const prev = t;
-            t = b.alliesInRadius(prev.x, prev.y, SPRING_BOUNCE_RANGE).filter((u) => !hit.has(u)).sort((p, q) => Math.hypot(p.x - prev.x, p.y - prev.y) - Math.hypot(q.x - prev.x, q.y - prev.y) || aggroCmp(p, q))[0];
+            t = b.alliesInRadius(prev.x, prev.y, SPRING_BOUNCE_RANGE).filter((u) => !hit.has(u) && !evadesGround(e2, u)).sort((p, q) => Math.hypot(p.x - prev.x, p.y - prev.y) - Math.hypot(q.x - prev.x, q.y - prev.y) || aggroCmp(p, q))[0];
           }
         } else { // 十连击
           b.fx('beam', { x: e2.x, y: e2.y, from: e2.id, to: t0.id, kind: 'springCombo' });