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/participants/destroy.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Actions
+    module Admin
+      module Tournaments
+        module Participants
+          class Destroy < EuchreCamp::Action
+            include Deps[participants_repo: 'repositories.event_participants']
+
+            def handle(request, response)
+              tournament_id = request.params[:id]
+              player_id = request.params[:player_id]
+
+              participants_repo.remove_player(tournament_id, player_id.to_i)
+
+              response.flash[:message] = "Player removed from tournament"
+              response.redirect_to("/admin/tournaments/#{tournament_id}")
+            rescue StandardError => e
+              response.flash[:error] = "Failed to remove player: #{e.message}"
+              response.redirect_to("/admin/tournaments/#{tournament_id}")
+            end
+          end
+        end
+      end
+    end
+  end
+end