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

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

backend/app/services/tournaments/fill_knockout_sources.rb

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+module Tournaments
+  class FillKnockoutSources
+    def self.call(tournament)
+      new(tournament).call
+    end
+
+    def initialize(tournament)
+      @tournament = tournament
+    end
+
+    def call
+      @tournament.matches.find_each do |match|
+        next if match.home_source_kind.blank? && match.away_source_kind.blank?
+        home = resolve(match, :home)
+        away = resolve(match, :away)
+        attrs = {}
+        attrs[:home_participant] = home if home && match.home_participant_id.blank?
+        attrs[:away_participant] = away if away && match.away_participant_id.blank?
+        match.update!(attrs) if attrs.any?
+      end
+    end
+
+    private
+
+    def resolve(match, side)
+      kind = match.public_send("#{side}_source_kind")
+      case kind
+      when "winner_match"
+        source = Match.find_by(id: match.public_send("#{side}_source_match_id"))
+        source&.winner_participant
+      when "group_rank"
+        group = TournamentGroup.find_by(id: match.public_send("#{side}_source_group_id"))
+        rank = match.public_send("#{side}_source_rank").to_i
+        return nil unless group && rank.positive?
+
+        Tournaments::Standings.call(group)[rank - 1]&.participant
+      end
+    end
+  end
+end