chore: add project scaffolding, third-party assets and settings

- Terrain, Prefabs, Textures, Modelle (u. a. Lieferkarton-/Vibrations-
  Rohdaten in Assets/Data)
- Third-Party-Pakete: TextMesh Pro, Toby Fredson Foliage Engine, Sat
  Productions Street Lights, ProBuilder Data
- Neue Szene Boot.unity, Shop-Szenenordner
- Package-Manifest/Lock, ProjectSettings, Build-Profile, .slnx
- Doku: EDITOR_SETUP.md, INSTALL.md, TODO.md

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Assets/Toby Fredson/The Toby Foliage Engine/The Toby Foliage Engine - Documentation.pdf.meta

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