feat: Add DSS infrastructure, remove legacy admin-ui code

- Remove legacy admin-ui/js/ vanilla JS components
- Add .dss/ directory with core tokens, skins, themes
- Add Storybook configuration and generated stories
- Add DSS management scripts (dss-services, dss-init, dss-setup, dss-reset)
- Add MCP command definitions for DSS plugin
- Add Figma sync architecture and scripts
- Update pre-commit hooks with documentation validation
- Fix JSON trailing commas in skin files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.dss/data/_system/tokens/resolved-meta.json

@@ -0,0 +1,11 @@
+{
+  "resolved_at": "2025-12-10T21:38:48.326466",
+  "skin": "shadcn",
+  "theme": "default",
+  "token_count": 68,
+  "layers": [
+    "core/primitives",
+    "skins/shadcn",
+    "themes/default"
+  ]
+}