feedback1 integrate: WT 蒂比's 起飞 is 对地规避 - ground enemies no longer select or hit her while airborne

Conflicts resolved keeping both sides:
- buffs.js FLAG_KEYS: liftoff beside the integration's selfBound.
- Battle.js: targeting import union (extendedGrid + evadesGround); _blockerFor keeps the
  fenced-tile gate (WU) and adds liftoff; applyStatus keeps the 无敌 + 无法选中 refusal and
  adds the 对地规避 refusal.
- enemies.js: header DOT entry from WT with the integration's INVISIBLE entry; import union;
  enemy_1273_stmgun_2 keeps the integration's rewrite (it filters through canTargetAlly,
  which now includes liftoff).
- tier2.js 蒂比 comment: the integration's 受到伤害前触发 text plus the 起飞 line.
- tier5.js 隐德来希 血镰: liftoff flag with the integration's foesInRadius.
- SIM.md: blocking keeps the fenced-tile passage and adds air-only blocking while airborne;
  the 污染秽蚀 / 燃烧区域 sentence goes before the chimera aura; statuses keep both refusals.

server/sim/buffs.js

@@ -28,11 +28,15 @@ export const MUL_KEYS = Object.freeze([
   'trueTakenMul', 'elemTakenMul', 'elementalTakenMul', 'healingDealtMul', 'healingTakenMul', 'spRecoveryMul', 'redeployMul',
   'atkScaleMul', 'physDealtMul', 'artsDealtMul',
 ]);
-/** Boolean flag keys (OR). `taunt` is also accepted as a numeric mod. */
+/**
+ * Boolean flag keys (OR). `taunt` is also accepted as a numeric mod. `liftoff` = 起飞 of an ally (蒂比's skills): blocks
+ * no ground enemy (Battle._blockerFor), 对地规避 against ground enemies (targeting.js evadesGround); it stays a ground
+ * unit on its tile (`unit.ground` unchanged).
+ */
 export const FLAG_KEYS = Object.freeze([
   'stun', 'freeze', 'sleep', 'silence', 'disarm', 'stealth', 'invulnerable', 'unblockable', 'levitate', 'fear',
   'cold', 'reveal', 'bind', 'noHeal', 'untargetable', 'blockFly', 'noMove', 'noSp', 'burstLock', 'hidden',
-  'noBlock', 'tremble', 'hitCount', 'hitCountArts', 'attract', 'float', 'noDisplace', 'isolated', 'camou',
+  'noBlock', 'tremble', 'hitCount', 'hitCountArts', 'attract', 'float', 'noDisplace', 'isolated', 'camou', 'liftoff',
   // 自缚 (the unit's own immobility: 守墓石像's 转换模式, the 自缚 leaders) beside its `noMove` — 束缚 sets noMove too, and
   // only 自缚 makes a unit "不视为可达目标" for 余 S2's teleport (PRTS 余 S2 备注)
   'selfBound',