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/actions/admin/tournaments/results.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Actions
+    module Admin
+      module Tournaments
+        class Results < EuchreCamp::Action
+          include Deps[
+            events_repo: 'repositories.events',
+            rounds_repo: 'repositories.tournament_rounds',
+            matchups_repo: 'repositories.bracket_matchups',
+            teams_repo: 'repositories.teams'
+          ]
+
+          def handle(request, response)
+            tournament_id = request.params[:id]
+
+            tournament = events_repo.by_id(tournament_id)
+            current_round = rounds_repo.current_round(tournament_id)
+
+            if current_round.nil?
+              response.flash[:error] = "No active round to enter results"
+              response.redirect_to("/admin/tournaments/#{tournament_id}")
+              return
+            end
+
+            matchups = matchups_repo.by_round(current_round[:id])
+            teams = teams_repo.by_event(tournament_id)
+
+            response.render(view,
+              tournament: tournament,
+              round: current_round,
+              matchups: matchups,
+              teams: teams
+            )
+          end
+        end
+      end
+    end
+  end
+end