Horizons generates context-aware domain names for projects

When users create a new Horizons project, the generated subdomain now reflects the project's purpose based on the initial prompt. For example, instead of a random identifier like indigo-lion-802980.hostingersite.com, users now get descriptive names like calendar-app-802980.hostingersite.com. This addresses a previously reported pain point where managing multiple projects was difficult due to indistinguishable project names.