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/models/team.rb

@@ -12,8 +12,12 @@ class Team < ApplicationRecord
   has_one_attached :photo_file
 
   validates :name, presence: true
+  validates :sport_key, presence: true
+  validate :sport_key_known
   validate :photo_file_type, if: -> { photo_file.attached? }
 
+  before_validation :normalize_sport_key
+
   def subscription
     club.subscription
   end
@@ -43,8 +47,35 @@ class Team < ApplicationRecord
     end
   end
 
+  def sport_label
+    Sports::Catalog.find_optional(sport_key)&.dig(:label) || sport_key.to_s.humanize
+  end
+
+  def effective_board_type
+    Sports::Catalog.board_for(sport_key)
+  end
+
+  def sport
+    sport_key
+  end
+
+  def sport=(value)
+    self.sport_key = Sports::Catalog.normalize_key(value)
+  end
+
   private
 
+  def normalize_sport_key
+    self.sport_key = Sports::Catalog.normalize_key(sport_key) if sport_key.present?
+  end
+
+  def sport_key_known
+    return if sport_key.blank?
+    return if Sports::Catalog.find_optional(sport_key)
+
+    errors.add(:sport_key, "non valido")
+  end
+
   def photo_file_type
     return if photo_file.content_type.in?(%w[image/png image/jpeg image/webp])