Restructured project

- backend moved to backend directory
- added and initialized frontend with vue
- moved infrastructure files to infra directory

frontend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "vue": "^3.5.30"
+  },
+  "devDependencies": {
+    "@types/node": "^24.12.0",
+    "@vitejs/plugin-vue": "^6.0.5",
+    "@vue/tsconfig": "^0.9.0",
+    "typescript": "~5.9.3",
+    "vite": "^8.0.1",
+    "vue-tsc": "^3.2.5"
+  }
+}