feat(assets): add body type segment GLBs for all 11 body types

Adds 198 body segment GLBs (11 body types × 18 segments each) to
client/assets/characters/bodies/:

DIRECT BODY TYPES (6): average_m, average_f, muscular_m, muscular_f,
teen_m, teen_f — segmented from Quaternius FullBody GLTF exports

FORK BODY TYPES (5, auto-scaled from source mesh):
  thin_m, thin_f   — scale (0.82, 1.0, 0.88), narrower/ectomorph
  heavy_m, heavy_f — scale (1.20, 1.08, 1.0), wider/endomorph
  child            — scale (0.75, 0.72, 0.75), forked from teen_m

Each body type contains 18 segments:
  seg_head, seg_neck, seg_torso, seg_torso_upper,
  seg_arm_upper_l/r, seg_arm_lower_l/r, seg_hand_l/r,
  seg_leg_upper_l/r, seg_leg_lower_l/r, seg_foot_l/r,
  seg_eyes, seg_eyebrows

Fork directories include README.md flagging auto-generated status
and scale values. Fork proportions may need artist refinement.

Segmentation uses BMesh vertex-weight selection + 1-ring boundary
overlap for seam-free deformation. D-159 (11 body types), D-160
(18 segments), D-164 (Quaternius source assets).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/assets/characters/bodies/child/README.md

@@ -0,0 +1,13 @@
+# Fork body type — auto-generated from mesh scaling
+
+This directory contains **child** body segments, generated by applying
+a proportional mesh scale to the source body (Teen_Male_FullBody.gltf):
+
+  Scale: (0.75, 0.72, 0.75)
+
+These segments are APPROXIMATE. They produce a visually distinct silhouette
+but are not artist-authored from scratch. Review the proportions and refine
+the base mesh manually if the auto-scale result is not satisfactory.
+
+Status: auto-generated, needs artist review
+Sprint 28 — visual team

client/assets/characters/bodies/heavy_f/README.md

@@ -0,0 +1,13 @@
+# Fork body type — auto-generated from mesh scaling
+
+This directory contains **heavy_f** body segments, generated by applying
+a proportional mesh scale to the source body (Regular_Female_FullBody.gltf):
+
+  Scale: (1.20, 1.08, 1.00)
+
+These segments are APPROXIMATE. They produce a visually distinct silhouette
+but are not artist-authored from scratch. Review the proportions and refine
+the base mesh manually if the auto-scale result is not satisfactory.
+
+Status: auto-generated, needs artist review
+Sprint 28 — visual team

client/assets/characters/bodies/heavy_m/README.md

@@ -0,0 +1,13 @@
+# Fork body type — auto-generated from mesh scaling
+
+This directory contains **heavy_m** body segments, generated by applying
+a proportional mesh scale to the source body (Regular_Male_FullBody.gltf):
+
+  Scale: (1.20, 1.08, 1.00)
+
+These segments are APPROXIMATE. They produce a visually distinct silhouette
+but are not artist-authored from scratch. Review the proportions and refine
+the base mesh manually if the auto-scale result is not satisfactory.
+
+Status: auto-generated, needs artist review
+Sprint 28 — visual team