Introduce architettura multi-sport con catalogo, engine scoring e overlay.

Catalogo sport in YAML, board implicito, engine per volley/basket/timed/racket/timer/generic, regia e app Android allineate.

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

backend/app/services/scoring/sync_state.rb

@@ -1,27 +1,13 @@
 module Scoring
   # Sincronizza lo stato completo del tabellone (app mobile / Action Cable).
   class SyncState
-    SCORE_KEYS = %w[home_sets away_sets home_points away_points current_set].freeze
-
     def initialize(session:, payload:)
       @session = session
       @payload = payload.stringify_keys
     end
 
     def call
-      score = @session.score_state || @session.create_score_state!(
-        home_sets: 0, away_sets: 0, home_points: 0, away_points: 0, current_set: 1, set_partials: []
-      )
-
-      attrs = {}
-      SCORE_KEYS.each do |key|
-        attrs[key] = @payload[key] if @payload.key?(key)
-      end
-      attrs[:set_partials] = @payload["set_partials"] if @payload.key?("set_partials")
-
-      score.update!(attrs)
-      SessionChannel.broadcast_message(@session, score.as_cable_payload)
-      score
+      Engine.for(@session.match).sync(session: @session, payload: @payload)
     end
   end
 end