Add Twilio SMS service, enhance booking/confirmation flow, and update home UI

- Add TwilioService for SMS notifications
- Extend PrenotazioneService and ConfermaServiceImpl with new booking/confirmation logic
- Add phone number support in UtenteAppService and UtenteAppServiceImpl
- Update PrenotazioneRepository with custom queries
- Enhance ConfermaResource and PrenotazioneResource REST endpoints
- Add MailService improvements
- Update application.yml with new config entries
- Update home page (home.vue, home.json, global.scss) and add Artegna logo

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

build.gradle

@@ -80,6 +80,9 @@ dependencies {
     implementation "org.hibernate.orm:hibernate-jcache"
     implementation "org.hibernate.validator:hibernate-validator"
     implementation "org.postgresql:postgresql"
+    implementation "io.seruco.encoding:base62:0.1.3"
+    implementation "com.twilio.sdk:twilio:11.3.6"
+
     testImplementation(libs.archunit.junit5.api) {
         exclude group: 'org.slf4j', module: 'slf4j-api'
     }