add client: React + Vite + Capacitor prototype

Web app React 18 + TypeScript con quattro schermate: Setup (URL server +
password + test connessione), Ingredients (lista ingredienti e preferenze),
Recipes (lista 3 ricette generate), RecipeDetail (dettaglio e procedimento).
Persistenza URL/password via Capacitor Preferences. Pronto per build Android.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/tsconfig.node.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.ts", "capacitor.config.ts"]
+}