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/config/figma.json

@@ -0,0 +1,20 @@
+{
+  "_meta": {
+    "description": "Figma configuration - IMMUTABLE (survives resets)",
+    "protected": true
+  },
+  "token": "figd_ScdBk47HlYEItZbQv2CcF9aq-3TfWbBXN3yoRKWA",
+  "uikit_reference": {
+    "file_key": "evCZlaeZrP7X20NIViSJbl",
+    "name": "Obra-shadcn-ui-uikit",
+    "url": "https://www.figma.com/design/evCZlaeZrP7X20NIViSJbl/Obra-shadcn-ui--uikit-"
+  },
+  "files": [
+    {
+      "key": "evCZlaeZrP7X20NIViSJbl",
+      "name": "Obra-shadcn-ui-uikit",
+      "type": "uikit"
+    }
+  ],
+  "teams": []
+}