feat: configure and display public seller descriptions

apps/web/src/pages/AdminSettingsPage.vue

@@ -4,7 +4,7 @@ import { onMounted, reactive, ref } from 'vue';
 import { getAdminSettings, updateAdminSettings } from '@/services/admin-settings-service.js';
 
 const settings = reactive({
-  general: { publicContactEmail: '', publicContactPhone: '' },
+  general: { publicDescription: '', publicContactEmail: '', publicContactPhone: '' },
   inventory: { maxImagesPerItem: 10 },
   pricing: { defaultStrategy: 'median' },
   security: { sessionIdleMinutes: 60 },
@@ -63,6 +63,9 @@ onMounted(load);
     <form v-if="!isLoading" class="admin-workspace-grid" @submit.prevent="save">
       <fieldset class="showcase-panel">
         <legend>General</legend>
+        <label class="fixture-label" for="settings-description">Public seller description (optional)</label>
+        <p id="settings-description-help">Shown on public listing and product pages. Up to 2,000 characters. Clear to remove.</p>
+        <textarea id="settings-description" v-model="settings.general.publicDescription" class="fixture-input" rows="5" maxlength="2000" aria-describedby="settings-description-help" />
         <label class="fixture-label" for="settings-email">Public contact email</label>
         <input id="settings-email" v-model="settings.general.publicContactEmail" class="fixture-input" type="email" />
         <label class="fixture-label" for="settings-phone">Public contact phone</label>