Club come entità principale, branding e fix infrastruttura streaming.

Introduce clubs con abbonamento, branding Active Storage e flusso registrazione società; corregge healthcheck MediaMTX (immagine distroless) e allinea dominio produzione matchlivetv.it.

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

backend/app/views/public/clubs/show.html.erb

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+<% content_for :title, "#{@club.name} — Società" %>
+<% content_for :robots, "noindex, nofollow" %>
+
+<div class="wrap club-dashboard" style="padding-top:20px">
+  <header class="club-header" style="--club-primary:<%= @club.effective_primary_color %>;--club-secondary:<%= @club.effective_secondary_color %>">
+    <% if @club.effective_logo_url.present? %>
+      <%= image_tag @club.effective_logo_url, alt: "", class: "club-header-logo", width: 56, height: 56 %>
+    <% end %>
+    <div>
+      <h1><%= @club.name %></h1>
+      <% if @entitlements %>
+        <p class="club-meta">
+          Piano: <strong><%= @entitlements.plan.name %></strong>
+          · Squadre: <strong><%= @teams.size %></strong>
+        </p>
+      <% end %>
+    </div>
+  </header>
+
+  <div style="display:flex;gap:12px;flex-wrap:wrap;margin:20px 0">
+    <%= link_to "Modifica società", public_edit_club_path(@club), class: "btn btn-secondary" %>
+    <%= link_to "Abbonamento", public_club_billing_path(@club), class: "btn btn-primary" %>
+    <%= link_to "Nuova squadra", public_new_club_team_path(@club), class: "btn btn-secondary" %>
+    <%= link_to "Dirette live", public_live_index_path, class: "btn btn-secondary" %>
+  </div>
+
+  <h2>Squadre</h2>
+  <div class="card">
+    <% if @teams.any? %>
+      <table class="data">
+        <thead><tr><th>Squadra</th><th>Branding</th><th></th></tr></thead>
+        <tbody>
+          <% @teams.each do |team| %>
+            <tr>
+              <td>
+                <span class="team-swatch" style="background:<%= team.effective_primary_color %>"></span>
+                <strong><%= team.name %></strong>
+              </td>
+              <td style="color:#888;font-size:0.88rem">
+                <% if team.logo_url.present? || team.logo_file.attached? || team.primary_color.present? %>
+                  Personalizzato
+                <% else %>
+                  Eredita dalla società
+                <% end %>
+              </td>
+              <td style="white-space:nowrap">
+                <%= link_to "Dashboard", public_team_dashboard_path(team) %>
+                ·
+                <%= link_to "Modifica", public_edit_team_path(team) %>
+              </td>
+            </tr>
+          <% end %>
+        </tbody>
+      </table>
+    <% else %>
+      <p style="color:#888">Nessuna squadra. <%= link_to "Aggiungi la prima", public_new_club_team_path(@club) %>.</p>
+    <% end %>
+  </div>
+
+  <p style="color:#888;margin-top:24px">Ogni squadra ha il proprio staff trasmissione/regia. L’abbonamento vale per tutta la società.</p>
+</div>