Aggiunge abbonamenti omaggio admin per sponsor e promozioni.

Gli admin possono concedere o revocare Premium Light/Full senza Stripe;
il piano omaggio ha priorità sui webhook e la società vede un messaggio dedicato.

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

backend/app/views/admin/clubs/_comped_form.html.erb

@@ -0,0 +1,56 @@
+<%# locals: (club:, subscription:, return_to: nil) %>
+<section class="admin-comped-card" style="margin-bottom:24px;padding:16px;border:1px solid #3d3520;border-radius:8px;background:#2a2618">
+  <h2 style="margin:0 0 8px;font-size:1.1rem">Abbonamento omaggio</h2>
+  <p style="color:#bbb;font-size:0.9rem;margin:0 0 14px">
+    Sponsor o promozione: assegna Premium Light/Full senza pagamento Stripe. Revocabile in qualsiasi momento.
+  </p>
+
+  <% sub = subscription %>
+  <% if sub&.admin_comped? %>
+    <p style="margin:0 0 12px">
+      <strong>Attivo:</strong> <%= sub.plan.name %>
+      <% if sub.admin_comped_reason.present? %>
+        · <%= sub.admin_comped_reason %>
+      <% end %>
+      <% if sub.admin_comped_at.present? %>
+        <br><span style="color:#888;font-size:0.85rem">Dal <%= l(sub.admin_comped_at, format: :long) %>
+        <% if sub.admin_comped_by.present? %> · admin <%= sub.admin_comped_by.username %><% end %>
+        </span>
+      <% end %>
+      <% if sub.stripe_subscription_id.present? %>
+        <br><span style="color:#888;font-size:0.85rem">Nota: esiste anche un abbonamento Stripe collegato; l’omaggio ha priorità sul piano.</span>
+      <% end %>
+    </p>
+    <%= button_to "Revoca omaggio (torna Free o ripristina Stripe)",
+          revoke_comped_admin_club_path(club, return_to: return_to),
+          method: :delete,
+          class: "admin-btn admin-btn--secondary",
+          form: { data: { turbo_confirm: "Revocare l’abbonamento omaggio per #{club.name}?" } } %>
+  <% else %>
+    <p style="margin:0 0 12px;color:#888">
+      Piano attuale: <strong><%= sub&.plan&.name || "Free" %></strong>
+      <% if sub&.stripe_subscription_id.present? %>
+        · pagamento Stripe attivo
+      <% end %>
+    </p>
+    <%= form_with url: grant_comped_admin_club_path(club), method: :post, local: true, class: "admin-comped-form" do %>
+      <%= hidden_field_tag :return_to, return_to if return_to.present? %>
+      <div style="display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end">
+        <label style="display:flex;flex-direction:column;gap:4px;font-size:0.85rem">
+          Piano
+          <%= select_tag :plan_slug,
+                options_for_select(
+                  [["Premium Light", "premium_light"], ["Premium Full", "premium_full"]]
+                ),
+                required: true,
+                class: "admin-input" %>
+        </label>
+        <label style="display:flex;flex-direction:column;gap:4px;font-size:0.85rem;flex:1;min-width:200px">
+          Motivo (es. sponsor 2026)
+          <%= text_field_tag :reason, nil, placeholder: "Sponsor, promozione…", class: "admin-input", style: "width:100%" %>
+        </label>
+        <%= submit_tag "Concedi omaggio", class: "admin-btn admin-btn--primary" %>
+      </div>
+    <% end %>
+  <% end %>
+</section>