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/services/teams/staff_assignment.rb

@@ -0,0 +1,85 @@
+module Teams
+  class StaffAssignmentError < StandardError
+    attr_reader :message
+
+    def initialize(message)
+      @message = message
+      super(message)
+    end
+  end
+
+  class StaffAssignment
+    def self.call(team:, user:, staff_kind:, membership: nil)
+      new(team: team, user: user, staff_kind: staff_kind, membership: membership).call
+    end
+
+    def initialize(team:, user:, staff_kind:, membership: nil)
+      @team = team
+      @user = user
+      @staff_kind = staff_kind.to_s
+      @membership = membership
+    end
+
+    def call
+      unless TeamInvitation::STAFF_KINDS.include?(@staff_kind)
+        raise StaffAssignmentError, "Ruolo staff non valido"
+      end
+
+      StaffEmailValidator.assert_available!(team: @team, email: @user.email, staff_kind: @staff_kind, except_user: @user)
+
+      ut = @membership || @user.user_teams.find_by!(team: @team)
+      return ut if ut.staff_kind == @staff_kind
+
+      ent = Entitlements.new(@team)
+      ent.assert_can_invite!(staff_kind: @staff_kind)
+      ut.update!(staff_kind: @staff_kind)
+      ut
+    end
+
+  end
+
+  class StaffEmailValidator
+    def self.assert_available!(team:, email:, staff_kind:, except_user: nil)
+      new(team: team, email: email, staff_kind: staff_kind, except_user: except_user).assert_available!
+    end
+
+    def initialize(team:, email:, staff_kind:, except_user: nil)
+      @team = team
+      @email = email.to_s.downcase.strip
+      @staff_kind = staff_kind.to_s
+      @except_user = except_user
+    end
+
+    def assert_available!
+      if @except_user
+        ut = @team.user_teams.find_by(user: @except_user)
+        if ut&.staff_kind.present? && ut.staff_kind != @staff_kind
+          other_label = ut.staff_kind == "regia" ? "regia" : "trasmissione"
+          raise StaffAssignmentError,
+                "Questo account è già staff #{other_label}. Trasmissione e regia devono essere email diverse."
+        end
+      end
+
+      conflict = conflicting_assignment
+      return unless conflict
+
+      other_label = conflict[:kind] == "regia" ? "regia" : "trasmissione"
+      raise StaffAssignmentError,
+            "L'email #{@email} è già assegnata come staff #{other_label}. Trasmissione e regia devono essere persone (email) diverse."
+    end
+
+    def conflicting_assignment
+      other_kind = @staff_kind == "transmission" ? "regia" : "transmission"
+
+      user_scope = @team.user_teams.joins(:user).where(users: { email: @email }).where(staff_kind: other_kind)
+      user_scope = user_scope.where.not(user_id: @except_user.id) if @except_user
+
+      return { kind: other_kind, source: :member } if user_scope.exists?
+
+      inv = @team.team_invitations.pending.where("LOWER(email) = ?", @email).where(staff_kind: other_kind)
+      return { kind: other_kind, source: :invitation } if inv.exists?
+
+      nil
+    end
+  end
+end