Fur authoring: Player-FurShellRenderer, Paint-HUD-Panel, Testszene & -material

Avatar-Setup und HUD-Autoring fuer das Fur-Feature (Code liegt in 1b783a3):
- Player.prefab: FurShellRenderer am Player verdrahtet, furLength-Default 0.5
- PaintHudPanel.prefab: Slider_FurLength + Fur-Panel-Widgets
- The Room.unity: Fur-Testaufbau
- FurShell_Test.mat: Test-Material fuer den Shell-Shader

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

Assets/Shaders/FurShell_Test.mat.meta

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