Feat(connectivity): invite visitors to add their country's import list

Closes the "Import a List" grid with a muted line linking to the open
country-list issue, so a visitor who finds their country missing sees
where to add it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

frontend/components/widgets/ConnectivityAddDialog.vue

@@ -59,6 +59,16 @@
                 </DropdownMenuContent>
               </DropdownMenu>
             </li>
+            <!-- Closing invite to contribute a country list; scrolls with the grid. -->
+            <li class="md:col-span-2 px-1 py-1 text-xs text-muted-foreground leading-relaxed">
+              <i18n-t keypath="connectivity.importDialog.MissingCountry" tag="p" scope="global" class="m-0">
+                <template #link>
+                  <a href="https://github.com/jason5ng32/MyIP/issues/452" target="_blank" rel="noopener noreferrer"
+                    class="underline underline-offset-4 decoration-current/40 hover:text-foreground hover:decoration-current">
+                    {{ t('connectivity.importDialog.MissingCountryLink') }}</a>
+                </template>
+              </i18n-t>
+            </li>
           </ul>
           <!-- Success stays quiet; only cap / list-limit errors show here. -->
           <div class="flex items-center justify-end min-h-4 text-xs">

frontend/locales/en.json

@@ -1837,7 +1837,9 @@
       "Import": "Import",
       "NotEnoughCapacity": "Not enough capacity — this list needs {need} slots, only {free} left.",
       "Destination": "Add to",
-      "ImportAsNew": "Import as a new list"
+      "ImportAsNew": "Import as a new list",
+      "MissingCountry": "Don't see your country? {link}",
+      "MissingCountryLink": "Add a list for it"
     },
     "lists": {
       "Tab": "Lists",

frontend/locales/fr.json

@@ -1837,7 +1837,9 @@
       "Import": "Importer",
       "NotEnoughCapacity": "Capacité insuffisante — cette liste nécessite {need} emplacements, seulement {free} restants.",
       "Destination": "Ajouter à",
-      "ImportAsNew": "Importer comme nouvelle liste"
+      "ImportAsNew": "Importer comme nouvelle liste",
+      "MissingCountry": "Votre pays n'y figure pas ? {link}",
+      "MissingCountryLink": "Ajoutez une liste pour lui"
     },
     "lists": {
       "Tab": "Listes",

frontend/locales/pt-BR.json

@@ -1837,7 +1837,9 @@
       "Import": "Importar",
       "NotEnoughCapacity": "Capacidade insuficiente — esta lista precisa de {need} vagas, mas só restam {free}.",
       "Destination": "Adicionar a",
-      "ImportAsNew": "Importar como nova lista"
+      "ImportAsNew": "Importar como nova lista",
+      "MissingCountry": "Não encontrou seu país? {link}",
+      "MissingCountryLink": "Adicione uma lista para ele"
     },
     "lists": {
       "Tab": "Listas",

frontend/locales/ru.json

@@ -1837,7 +1837,9 @@
       "Import": "Импорт",
       "NotEnoughCapacity": "Недостаточно места — для списка нужно слотов: {need}, свободно: {free}.",
       "Destination": "Добавить в",
-      "ImportAsNew": "Импортировать как новый список"
+      "ImportAsNew": "Импортировать как новый список",
+      "MissingCountry": "Нет вашей страны? {link}",
+      "MissingCountryLink": "Добавьте для неё список"
     },
     "lists": {
       "Tab": "Списки",

frontend/locales/zh-TW.json

@@ -1837,7 +1837,9 @@
       "Import": "匯入",
       "NotEnoughCapacity": "容量不足——該清單需要 {need} 個空位，僅剩 {free} 個",
       "Destination": "加入到",
-      "ImportAsNew": "匯入為新清單"
+      "ImportAsNew": "匯入為新清單",
+      "MissingCountry": "沒有你所在國家的清單？{link}",
+      "MissingCountryLink": "來新增一個"
     },
     "lists": {
       "Tab": "清單",

frontend/locales/zh.json

@@ -1837,7 +1837,9 @@
       "Import": "导入",
       "NotEnoughCapacity": "容量不足——该列表需要 {need} 个空位，仅剩 {free} 个",
       "Destination": "添加到",
-      "ImportAsNew": "导入为新列表"
+      "ImportAsNew": "导入为新列表",
+      "MissingCountry": "没有你所在国家的列表？{link}",
+      "MissingCountryLink": "来添加一个"
     },
     "lists": {
       "Tab": "列表",