chore: add project files and setup gitignore

reserva-mesa-dashboard/lib/firebase.ts

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+import { initializeApp, getApps } from "firebase/app";
+import { getAuth } from "firebase/auth";
+import { getDatabase } from "firebase/database";
+
+// As variáveis de ambiente devem ser configuradas no Vercel e no ficheiro .env.local
+const firebaseConfig = {
+  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY || "AIzaSyCPz7Pd3tJj3QkF7fV_vudCJythNsyR57k",
+  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN || "namesa-429c1.firebaseapp.com",
+  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID || "namesa-429c1",
+  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET || "namesa-429c1.firebasestorage.app",
+  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID || "476421715902",
+  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID || "1:476421715902:web:placeholder", // placeholder needed for web client SDK
+  // Nota importante: Como verificado na codebase Android, 
+  // O ReservaMesa usa Realtime Database e não Firestore.
+  databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL || "https://namesa-429c1-default-rtdb.firebaseio.com"
+};
+
+// Initialize Firebase only if there are no apps initialized yet
+const app = getApps().length === 0 ? initializeApp(firebaseConfig) : getApps()[0];
+
+export const auth = getAuth(app);
+export const db = getDatabase(app);
+export default app;

reserva-mesa-dashboard/lib/utils.ts

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+import { type ClassValue, clsx } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}