Aggiunge i tornei con hub, pagina pubblica e tabellone per semifinali e finali.

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

backend/app/services/tournaments/entitlements.rb

@@ -0,0 +1,43 @@
+module Tournaments
+  class EntitlementError < StandardError
+    attr_reader :code, :billing_url
+
+    def initialize(message, code:, billing_url: nil)
+      super(message)
+      @code = code
+      @billing_url = billing_url
+    end
+  end
+
+  class Entitlements
+    def initialize(club)
+      @club = club
+    end
+
+    def subscription
+      @subscription ||= @club.subscription
+    end
+
+    def premium_full?
+      subscription&.premium_full? == true
+    end
+
+    def billing_url
+      "#{MatchLiveTv.app_public_url.chomp('/')}/clubs/#{@club.id}/billing"
+    end
+
+    def assert_creatable!
+      assert_writable!
+    end
+
+    def assert_writable!
+      unless premium_full?
+        raise EntitlementError.new(
+          "I tornei sono disponibili con il piano Premium Full.",
+          code: "premium_full_required",
+          billing_url: billing_url
+        )
+      end
+    end
+  end
+end