feat(tournaments): add partnership tracking and tournament management

Implement comprehensive partnership tracking system and tournament
management features including round-robin, single/double elimination,
and Swiss system pairings.

Changes:
- Add partnership_games and partnership_stats tables
- Implement PartnershipTracker service for recording partnership data
- Add tournament generator with multiple formats
- Create tournament management actions and views
- Add acceptance tests for partnership tracking
- Fix PartnershipTracker to use single snapshot per player per match
- Fix round-robin test to query by round_number instead of hardcoded ID

Note: All 8 acceptance tests now passing

app/repositories/tournament_rounds.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rom-repository'
+
+module EuchreCamp
+  module Repositories
+    class TournamentRounds < ::EuchreCamp::Repository[:tournament_rounds]
+      commands :create, update: :by_pk, delete: :by_pk
+
+      def by_event(event_id)
+        tournament_rounds.where(event_id: event_id).order(:round_number).to_a
+      end
+
+      def current_round(event_id)
+        tournament_rounds
+          .where(event_id: event_id, status: 'active')
+          .order(Sequel.desc(:round_number))
+          .one
+      end
+
+      def next_round(event_id)
+        tournament_rounds
+          .where(event_id: event_id, status: 'pending')
+          .order(:round_number)
+          .limit(1)
+          .one
+      end
+    end
+  end
+end