Add freemium plans, wallet-billed host notifications, and Pro upgrades.

Host alerts use email/phone on the host record without requiring a Ladill
account link; SMS and over-quota emails debit the org wallet at platform rates.

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

resources/views/frontdesk/hosts/edit.blade.php

@@ -24,7 +24,8 @@
             <label class="flex items-center gap-2 text-sm"><input type="checkbox" name="is_available" value="1" @checked(old('is_available', $host->is_available))> Available for visits</label>
             <div>
                 <label class="block text-sm font-medium">Linked user (platform ID)</label>
-                <input type="text" name="user_ref" value="{{ old('user_ref', $host->user_ref) }}" placeholder="User public_id for host portal access" class="mt-1 w-full rounded-lg border-slate-300 text-sm">
+                <input type="text" name="user_ref" value="{{ old('user_ref', $host->user_ref) }}" placeholder="User public_id (optional)" class="mt-1 w-full rounded-lg border-slate-300 text-sm">
+                <p class="mt-1 text-xs text-slate-500">Optional — enables the host portal and in-app bell. Email and phone above are used for alerts.</p>
                 <p class="mt-1 text-xs text-slate-500">When set, this user can access the host self-service portal.</p>
             </div>
             <button type="submit" class="btn-primary w-full">Save changes</button>