Add ICS calendar support

src/server.py

@@ -53,7 +53,10 @@ def setup_services():
     if settings.is_calendar_configured():
         from services.calendar_service import CalendarService
         calendar_service = CalendarService(settings)
-        print(f"  Calendar service: enabled (CalDAV: {settings.caldav_url})")
+        if settings.is_caldav_configured():
+            print(f"  Calendar service: enabled (CalDAV: {settings.caldav_url})")
+        else:
+            print("  Calendar service: enabled (ICS calendars only)")
     else:
         print("  Calendar service: disabled (not configured)")
 
@@ -116,6 +119,7 @@ def get_server_info() -> dict:
             "calendar": {
                 "enabled": calendar_service is not None,
                 "caldav_url": settings.caldav_url if calendar_service else None,
+                "ics_calendars": [c[1] for c in settings.get_ics_calendars()] if calendar_service else [],
             },
             "contacts": {
                 "enabled": contacts_service is not None,