feat: add initial Slidev presentation and demo components

- Created Slidev presentation structure with index.md and contents.md.
- Implemented footer and menu components for navigation.
- Added Markdown preview component with syntax highlighting.
- Developed HTML template for consistent page structure.
- Introduced button component with variant support.
- Added Vue counter component for interactive demos.
- Configured content collections for documentation.
- Created multiple markdown documents for demo purposes.
- Established global and theme styles for consistent UI.
- Set up TypeScript configuration for better development experience.

solution/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "extends": "@kevisual/types/json/frontend.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@/*": [
+        "./src/*"
+      ],
+      "@/agent": [
+        "./src/agent"
+      ]
+    },
+  },
+  "include": [
+    "src/**/*",
+    "agent/**/*"
+  ],
+}