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/controllers/public/regia_controller.rb

@@ -1,6 +1,7 @@
 module Public
   class RegiaController < SiteBaseController
     include Public::LiveHelper
+    include Public::RegiaHelper
     include MediamtxPlayback
 
     layout "regia"
@@ -13,9 +14,7 @@ module Public
     def show
       @match = @session.match
       @team = @match.team
-      @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: []
-      )
+      @score = @session.score_state || Scoring::Engine.ensure_score_for(@session)
       @rules = Scoring::Rules.from_match(@match)
       @stream_closed = @session.terminal?
       @on_air = !@stream_closed && mediamtx_stream_playable?(@session)