feat(email-validation): implement email verification checks for booking creation and resend functionality

apps/backend/src/lib/auth.ts

@@ -31,11 +31,14 @@ export const auth = betterAuth({
     sendOnSignUp: true,
     autoSignInAfterVerification: true,
     sendVerificationEmail: async ({ user, url }) => {
+      const verificationUrl = new URL(url);
+      const appUrl = process.env.APP_BASE_URL ?? 'http://localhost:5173';
+      verificationUrl.searchParams.set('callbackURL', appUrl);
       await sendMail({
         to: user.email,
         subject: 'Verificá tu email en Playzer',
-        html: `Hacé click para verificar tu email: <a href="${url}">${url}</a>`,
-        text: `Hacé click para verificar tu email: ${url}`,
+        html: `Hacé click para verificar tu email: <a href="${verificationUrl.toString()}">${verificationUrl.toString()}</a>`,
+        text: `Hacé click para verificar tu email: ${verificationUrl.toString()}`,
       });
     },
   },