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

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

backend/app/models/tournament_participant.rb

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+class TournamentParticipant < ApplicationRecord
+  include Brandable
+
+  belongs_to :tournament
+  belongs_to :group, class_name: "TournamentGroup", optional: true
+  belongs_to :source_team, class_name: "Team", optional: true
+  has_many :home_matches, class_name: "Match", foreign_key: :home_participant_id, dependent: :nullify
+  has_many :away_matches, class_name: "Match", foreign_key: :away_participant_id, dependent: :nullify
+
+  validates :name, presence: true
+  validates :position, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+
+  after_update :sync_related_match_names, if: :saved_change_to_name?
+
+  def branding_parent
+    source_team || tournament
+  end
+
+  def effective_logo_url
+    if logo_file.attached?
+      Rails.application.routes.url_helpers.rails_blob_path(logo_file, only_path: true)
+    elsif logo_url.present?
+      logo_url
+    else
+      source_team&.effective_logo_url
+    end
+  end
+
+  private
+
+  def sync_related_match_names
+    Match.where(home_participant_id: id).or(Match.where(away_participant_id: id)).find_each(&:save!)
+  end
+end
+