Phase 0.3-0.5: SVG export + YAML sidecars + asset catalog

- Add hair class KeyMap entries (基髪→BaseHair, 前髪→FrontHair, 胸毛→ChestHair)
- Implement cardinal spline → cubic Bezier SVG export for all 175 body parts
- Generate YAML sidecar files (part.yaml) per part with metadata
- Write Catalog.yaml index for runtime asset loading
- Output to SlaveMatrix/Assets/Parts/{EnglishName}/ structure
- Each part directory contains part.yaml + x{x}y{y}.svg morph variants
- 838 SVGs across 324 morph variants, 175 sidecars, 1 catalog
- Extraction tool now serves as the asset build pipeline step

SlaveMatrix/Assets/Parts/性器/part.yaml

@@ -0,0 +1,129 @@
+id: 性器
+original_key: 性器
+resource: 性器
+morph_x: 4
+morph_y: 6
+variants:
+- x: 0
+  y: 0
+  file: x0y0.svg
+- x: 0
+  y: 1
+  file: x0y1.svg
+- x: 0
+  y: 2
+  file: x0y2.svg
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+  file: x0y3.svg
+- x: 0
+  y: 4
+  file: x0y4.svg
+- x: 0
+  y: 5
+  file: x0y5.svg
+- x: 1
+  y: 0
+  file: x1y0.svg
+- x: 1
+  y: 1
+  file: x1y1.svg
+- x: 1
+  y: 2
+  file: x1y2.svg
+- x: 1
+  y: 3
+  file: x1y3.svg
+- x: 1
+  y: 4
+  file: x1y4.svg
+- x: 1
+  y: 5
+  file: x1y5.svg
+- x: 2
+  y: 0
+  file: x2y0.svg
+- x: 2
+  y: 1
+  file: x2y1.svg
+- x: 2
+  y: 2
+  file: x2y2.svg
+- x: 2
+  y: 3
+  file: x2y3.svg
+- x: 2
+  y: 4
+  file: x2y4.svg
+- x: 2
+  y: 5
+  file: x2y5.svg
+- x: 3
+  y: 0
+  file: x3y0.svg
+- x: 3
+  y: 1
+  file: x3y1.svg
+- x: 3
+  y: 2
+  file: x3y2.svg
+- x: 3
+  y: 3
+  file: x3y3.svg
+- x: 3
+  y: 4
+  file: x3y4.svg
+- x: 3
+  y: 5
+  file: x3y5.svg
+fields:
+- name: 小陰唇
+- name: 性器基
+- name: 陰核
+- name: 尿道
+- name: 膣口
+joints:
+- position: [
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+]
+- position: [
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+- position: [
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+- position: [
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+- position: [
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