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/schema/skin-contract.json

@@ -0,0 +1,87 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "DSS Skin Contract",
+  "description": "Defines required tokens that all skins must provide. Themes should only override these stable tokens.",
+  "version": "1.0.0",
+  "required_tokens": {
+    "color": {
+      "description": "Semantic color tokens",
+      "required": [
+        "primary",
+        "primary-foreground",
+        "secondary",
+        "secondary-foreground",
+        "background",
+        "foreground",
+        "muted",
+        "muted-foreground",
+        "accent",
+        "accent-foreground",
+        "destructive",
+        "destructive-foreground",
+        "border",
+        "input",
+        "ring",
+        "card",
+        "card-foreground",
+        "popover",
+        "popover-foreground"
+      ]
+    },
+    "effect": {
+      "description": "Shadow and focus effect tokens",
+      "required": [
+        "shadow-xs",
+        "shadow-sm",
+        "shadow-md",
+        "shadow-lg",
+        "shadow-xl",
+        "shadow-2xl",
+        "focus-ring"
+      ]
+    },
+    "radius": {
+      "description": "Border radius tokens",
+      "required": [
+        "sm",
+        "md",
+        "lg",
+        "xl",
+        "full"
+      ]
+    },
+    "typography": {
+      "description": "Typography style tokens",
+      "required": [
+        "heading-1",
+        "heading-2",
+        "heading-3",
+        "heading-4",
+        "paragraph-regular",
+        "paragraph-bold",
+        "paragraph-small-regular"
+      ]
+    },
+    "spacing": {
+      "description": "Spacing scale tokens",
+      "required": [
+        "0",
+        "1",
+        "2",
+        "3",
+        "4",
+        "5",
+        "6",
+        "8",
+        "10",
+        "12",
+        "16"
+      ]
+    }
+  },
+  "optional_categories": [
+    "animation",
+    "breakpoint",
+    "z-index"
+  ]
+}