Add conversion statues shown in resolution phase

In Conversion mode, capture a snapshot (pose index + paint) of each hider
at conversion time and materialize a frozen, painted statue at the found
spot for the resolution phase, independent of the now-hunter avatar.

- MatchStatue.cs (new): server-init pose/paint, network-driven pose then
  freeze, reveal-gate (hidden until paint applied), kills inherited sim.
- PlayerPaintSync: _isStatue (sibling auto-detect) suppresses the three
  auto-behaviours so MatchStatue drives the paint flow deterministically.
- MatchManager: statuePrefab; capture in ConvertToHunter; spawn on
  resolution enter; despawn + record clear on EndMatch/teardown/start.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/Network/MatchStatue.cs.meta

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