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feat(game): NPC crowd-control & forced-movement effects (Pull / Lift / Knockback / Dash / Leap / Fear) (#1439)

* Add SkillController/DisplacedUntil infrastructure for CC + forced-movement effects

Foundational plumbing the upcoming Pull/Lift/Knockback/Dash/Leap effects
rely on. Pure infrastructure — no observable behaviour change on its
own; the actual effects use these hooks in follow-up commits.

- Unit.DisplacedUntil (nullable DateTime). Set by knockback / impulse
  effects to a short future time; the Npc movement gate reads it and
  suppresses AI movement until it elapses so the displacement
  animation actually plays out client-side before the AI walks back.
- Npc.MoveTowards: two new early-return gates at the top of the
  method, BEFORE the speed multiplier — if an ActiveSkillController is
  in the Running state OR DisplacedUntil is in the future, AI
  movement is skipped this tick. Existing Stun/Sleep/Root/Knockdown/
  Fastened and Shackle/Snare guards remain untouched. The trailing
  redundant ActiveSkillController check from the original method is
  removed.
- BaseCombatBehavior.MoveInRange: matching DisplacedUntil early-return
  so the combat behaviour does not try to chase the target while the
  NPC is mid-knockback. CanUseSkill already had the Stun/Sleep/Silence
  and ActiveSkillController guards — no edit there.
- SkillController base: new SourceBuffId property. When a controller
  is created by a buff start hook, the buff id is propagated so the
  controller can ignore the very buff that started it during CC
  re-checks (a pull buff that also stuns should not cancel its own
  pull). Factory now wires Floating, Wandering, Leap, Dash instead of
  just Leap; default arguments on CreateSkillController keep the
  existing call site in Skill.cs working unchanged.

Co-Authored-By: Evenstone <evenstone@noreply.users.github.com>

* Implement KnockBack, ImpulseEffect, PhysicalExplosion, Blink for NPCs

Replaces the four upstream stubs with real s... (continued)

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