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>

admin-ui/.storybook/preview.js

@@ -0,0 +1,23 @@
+// Import DSS design tokens
+import '../css/tokens.css';
+
+/** @type { import('@storybook/html-vite').Preview } */
+const preview = {
+  parameters: {
+    controls: {
+      matchers: {
+       color: /(background|color)$/i,
+       date: /Date$/i,
+      },
+    },
+    backgrounds: {
+      default: 'light',
+      values: [
+        { name: 'light', value: '#ffffff' },
+        { name: 'dark', value: '#1a1a1a' },
+      ],
+    },
+  },
+};
+
+export default preview;