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/涎左/part.yaml

@@ -0,0 +1,23 @@
+id: 涎左
+original_key: 涎左
+resource: 胴体
+morph_x: 1
+morph_y: 5
+variants:
+- x: 0
+  y: 0
+  file: x0y0.svg
+- x: 0
+  y: 1
+  file: x0y1.svg
+- x: 0
+  y: 2
+  file: x0y2.svg
+- x: 0
+  y: 3
+  file: x0y3.svg
+- x: 0
+  y: 4
+  file: x0y4.svg
+fields:
+- name: 涎

SlaveMatrix/Assets/Parts/涎左/x0y0.svg

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+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1 1">
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SlaveMatrix/Assets/Parts/涎左/x0y1.svg

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SlaveMatrix/Assets/Parts/涎左/x0y2.svg

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SlaveMatrix/Assets/Parts/涎左/x0y3.svg

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SlaveMatrix/Assets/Parts/涎左/x0y4.svg

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