M1: add networked rigged player avatar (run-around character)

- Import Hodaart Low Poly Character Collection 3 (humanoid-rigged, LFS)
- PlayerAvatar.cs: owner-authoritative CharacterController movement, animation
  derived from measured speed on every client (no NetworkAnimator needed)
- OwnerAuthNetworkTransform.cs: owner-authoritative NetworkTransform
- PlayerLocomotion.controller: Idle/Walk/Run 1D blend tree on Speed (reuses
  Hodaart clips)
- PlayerCharacter.prefab (Character 01 + CC + NetworkObject + owner NT +
  PlayerAvatar + Animator w/ humanoid avatar); registered as PlayerPrefab
- Verified in play: spawns, visible, Idle pose (rig animates), owner-auth

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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