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/partnership_games.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rom-repository'
+
+module EuchreCamp
+  module Repositories
+    class PartnershipGames < ::EuchreCamp::Repository[:partnership_games]
+      commands :create, update: :by_pk, delete: :by_pk
+
+      def by_player(player_id)
+        partnership_games.where(
+          Sequel.|({ player_1_id: player_id }, { player_2_id: player_id })
+        ).to_a
+      end
+
+      def by_match(match_id)
+        partnership_games.where(match_id: match_id).to_a
+      end
+
+      def by_partnership(player_1_id, player_2_id)
+        partnership_games.where(
+          Sequel.|(
+            { player_1_id: player_1_id, player_2_id: player_2_id },
+            { player_1_id: player_2_id, player_2_id: player_1_id }
+          )
+        ).to_a
+      end
+    end
+  end
+end