feat(all): Big update for V2 version.

[HochCC]

Big update for V2 version.

✨ What's New in V2

• 💬 3D Vibe Coding — build and edit sim-ready scenes through natural-language dialogue via Claude Code slash commands (/embodiedgen:*), each edit a bounded, physics-validated skill call.
• 🏠 Large-scale scene generation — multi-room, navigable, instance-editable houses at controllable complexity tiers (minimalist → detail).
• 📦 One world, every simulator — a standardized layout loads with consistent geometry, collision, and physics across SAPIEN, Isaac Sim, Isaac Gym, MuJoCo, Genesis, and PyBullet.
• 🧩 Pluggable 3D backends — switch between SAM3D, TRELLIS, and the Hunyuan3D Pro cloud API with a single flag.
• 🧥 Beyond rigid bodies — text-conditioned garments deploy as deformable meshes in Genesis.
• 🦾 Part-level affordance — functional part segmentation, per-part semantics, and simulation-validated 6-DoF grasp poses for any generated asset.
• 🤖 Closed-loop robot learning — policies trained purely in EmbodiedGen-generated worlds transfer to real robots (task success 9.7 → 79.8% in sim, 21.7 → 75.0% on real robots.