Show linked domains on cards and fix Email leftovers.

Display hosted_sites on account cards, scope Afia and Settings to hosting,
add hosting_settings for notifications, and remove mailbox UI from the
hosting layout and account pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/HostingAccount.php

@@ -135,6 +135,26 @@ class HostingAccount extends Model
         return $this->hasMany(HostedSite::class);
     }
 
+    /** Primary label for UI lists — prefers linked hosted_sites over primary_domain. */
+    public function linkedDomainLabel(): ?string
+    {
+        if ($this->relationLoaded('sites') && $this->sites->isNotEmpty()) {
+            $domains = $this->sites->pluck('domain')->filter()->unique()->values();
+
+            if ($domains->count() === 1) {
+                return (string) $domains->first();
+            }
+
+            $preview = $domains->take(2)->implode(', ');
+
+            return $domains->count() > 2
+                ? "{$preview} +".($domains->count() - 2)
+                : $preview;
+        }
+
+        return filled($this->primary_domain) ? (string) $this->primary_domain : null;
+    }
+
     public function databases(): HasMany
     {
         return $this->hasMany(HostedDatabase::class);