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/style-dictionary.config.json

@@ -0,0 +1,20 @@
+{
+  "source": ["tokens/tokens.json"],
+  "platforms": {
+    "css": {
+      "transformGroup": "css",
+      "buildPath": "themes/",
+      "files": [{"destination": "tokens.css", "format": "css/variables"}]
+    },
+    "scss": {
+      "transformGroup": "scss",
+      "buildPath": "themes/",
+      "files": [{"destination": "_tokens.scss", "format": "scss/variables"}]
+    },
+    "json": {
+      "transformGroup": "js",
+      "buildPath": "themes/",
+      "files": [{"destination": "tokens.json", "format": "json/flat"}]
+    }
+  }
+}