Integrate humanoid walk/run animations and per-clip pose speed sliders

- Import Mixamo humanoid Walking + Running FBX, switch rig type to Humanoid
- Wire walkClip/runClip with per-clip speeds on Pose_Idle (walk 1.4, run 1.5)
- Add per-animation speed sliders (Range 0.1-3, default 1) to PlayerPose SO,
  applied per frame in PlayerPoseController for live tuning
- Reorganize pose assets: replace Pose_TPose with Pose_Hold, prune legacy
  Paintman-Run/-TPose .anim and paintman_UV.FBX
- Ignore UMotion plugin data/editor folders

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

Assets/Models/Paintman-UMotionProject.asset.meta

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