Aggiunge annunci in-app/sito, contatti e migliora UI copertina sul portale.

Include admin/API/banner nativi, form contatti e reset copertina standard con layout edit più ampio.

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

backend/app/views/admin/announcements/index.html.erb

@@ -0,0 +1,56 @@
+<% content_for :body_class, "admin-body" %>
+
+<div class="admin-page-head">
+  <h2 class="admin-page-title"><%= t("admin.announcements.index.title") %></h2>
+  <p class="muted admin-page-sub"><%= t("admin.announcements.index.lead") %></p>
+</div>
+
+<div class="panel" style="margin-bottom:1.5rem">
+  <div class="admin-toolbar">
+    <%= link_to t("admin.announcements.index.new"), new_admin_announcement_path, class: "admin-btn admin-btn--primary" %>
+  </div>
+</div>
+
+<div class="panel">
+  <h2><%= t("admin.announcements.index.table_title") %></h2>
+  <% if @announcements.any? %>
+    <div class="admin-table-wrap">
+      <table class="admin-table">
+        <thead>
+          <tr>
+            <th><%= t("admin.announcements.table.status") %></th>
+            <th><%= t("admin.announcements.table.kind") %></th>
+            <th><%= t("admin.announcements.table.title") %></th>
+            <th><%= t("admin.announcements.table.channels") %></th>
+            <th><%= t("admin.announcements.table.window") %></th>
+            <th></th>
+          </tr>
+        </thead>
+        <tbody>
+          <% @announcements.each do |item| %>
+            <tr>
+              <td>
+                <span class="badge badge--<%= announcement_status_badge(item) %>"><%= t("admin.announcements.status.#{item.status}") %></span>
+              </td>
+              <td class="muted"><%= t("admin.announcements.kind.#{item.kind}") %></td>
+              <td>
+                <strong><%= item.title %></strong>
+                <div class="muted" style="font-size:0.85rem;margin-top:0.25rem"><%= truncate(item.body, length: 90) %></div>
+              </td>
+              <td class="muted"><%= announcement_channels_label(item) %></td>
+              <td class="muted"><%= announcement_window_label(item) %></td>
+              <td class="admin-actions">
+                <%= link_to t("admin.announcements.actions.edit"), edit_admin_announcement_path(item), class: "admin-btn admin-btn--sm" %>
+                <%= button_to t("admin.announcements.actions.delete"), admin_announcement_path(item), method: :delete,
+                      class: "admin-btn admin-btn--sm admin-btn--danger",
+                      form: { data: { confirm: t("admin.announcements.actions.delete_confirm") } } %>
+              </td>
+            </tr>
+          <% end %>
+        </tbody>
+      </table>
+    </div>
+  <% else %>
+    <p class="empty"><%= t("admin.announcements.index.none") %></p>
+  <% end %>
+</div>