feat(01-01): install shadcn/ui components and lucide-react icons

- components.json configured (Radix preset, CSS variables, @/ aliases)
- src/lib/utils.ts: cn() helper with clsx + tailwind-merge
- 10 shadcn/ui components: button, card, badge, progress, input, label,
  select, separator, table, textarea
- lucide-react@0.511 installed for iconography
- clsx, tailwind-merge, class-variance-authority added as dependencies

components.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "default",
+  "rsc": true,
+  "tsx": true,
+  "tailwind": {
+    "config": "",
+    "css": "src/app/globals.css",
+    "baseColor": "neutral",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "iconLibrary": "lucide"
+}