Initial commit: step2urdf tool with handtuned JSON import.

Includes FastAPI backend, vendored step2urdf frontend, and A7 handtuned arm JSON for URDF generation.

frontend/tailwind.config.js

@@ -0,0 +1,10 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  purge: ['./index.html', './src/**/*.{vue,js,ts,jsx,tsx}'],
+  content: [],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+}
+