Add free full-body 3D live camera avatar examples

client/public/avatars/opensource3d/ATTRIBUTION.txt

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+3D full-body avatar preview cutouts in this folder are derived from the Open Source Avatars registry:
+https://github.com/ToxSam/open-source-avatars
+
+Registry summary:
+- Registry metadata/docs license: CC0
+- Individual avatars used here: CC0 from collection "100Avatars R3"
+
+Integrated examples:
+- BeachKing
+  Preview source: https://arweave.net/EGCdxkfTjjmNS4RGiAT_or17mG3717qnZ7R1EnZxLg8
+  Model source: https://arweave.net/uKhDMselhdUyeJKjelpuVsL8s-a9v_Wqq75TQfCfnos
+- Jenny
+  Preview source: https://arweave.net/4a6_AfH-PHvFMXqja7V42pF9hCn9ceIj5z5NAsK2SSs
+  Model source: https://arweave.net/kgTirc4OvUWbJhIKC2CB3_pYsYuB62KTj90IdE8s3sk
+- Juanita
+  Preview source: https://arweave.net/5RHeIXD9fezkpuFJS1TRtGkNIVfTKZP7Rkmh9pDmaTs
+  Model source: https://arweave.net/nyMyZZx5lN2DXsmBgbGQSnt3PuXYN7AAjz9QJrjitLo
+- SportTV
+  Preview source: https://arweave.net/_Qic8KV5P5mo5wJ2N3lbqX0iGVxtVDn4CxCUiM5-Qcg
+  Model source: https://arweave.net/ISYr7xBXT_s4tLddbhFB3PpUhWg-H_BYs2UZhVLF1hA
+
+Local files are optimized transparent WebP derivatives for faster in-browser overlay rendering.