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/package.json

@@ -11,7 +11,10 @@
     "test": "vitest",
     "test:watch": "vitest --watch",
     "test:ui": "vitest --ui",
-    "test:coverage": "vitest --coverage"
+    "test:coverage": "vitest --coverage",
+    "test:debug": "vitest --inspect-brk --inspect-port=9229 --no-coverage",
+    "storybook": "storybook dev -p 6006",
+    "build-storybook": "storybook build"
   },
   "dependencies": {
     "preact": "^10.19.0",
@@ -25,6 +28,15 @@
     "vite": "^5.0.0",
     "vite-plugin-pwa": "^0.17.0",
     "vitest": "^1.0.0",
-    "workbox-window": "^7.0.0"
+    "workbox-window": "^7.0.0",
+    "storybook": "^10.1.6",
+    "@storybook/html-vite": "^10.1.6",
+    "@chromatic-com/storybook": "^4.1.3",
+    "@storybook/addon-vitest": "^10.1.6",
+    "@storybook/addon-a11y": "^10.1.6",
+    "@storybook/addon-docs": "^10.1.6",
+    "playwright": "^1.57.0",
+    "@vitest/browser": "^1.0.0",
+    "@vitest/coverage-v8": "^1.0.0"
   }
 }