Add Elo rating system with match entry and CSV upload

- Implement EloCalculator service for 2v2 Euchre matches
- Create background job processing with GoodJob
- Add single match entry form
- Add CSV upload for batch match entry
- Create player rankings view
- Add database schema for matches and elo snapshots

app/actions/admin/matches/process_upload.rb

@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require "csv"
+
+module EuchreCamp
+  module Actions
+    module Admin
+      module Matches
+        class ProcessUpload < EuchreCamp::Action
+          include Deps[repo: 'repositories.matches']
+
+          def handle(request, response)
+            # In Hanami, file uploads are in request.params
+            file = request.params[:csv_file]
+            
+            unless file && file[:tempfile]
+              response.redirect_to("/admin/matches/upload")
+              return
+            end
+
+            matches_created = 0
+            errors = []
+
+            # Parse CSV
+            CSV.foreach(file[:tempfile].path, headers: true, header_converters: :symbol) do |row|
+              begin
+                # Map CSV columns to our database structure
+                # Expected columns: played_at, team_1_p1_name, team_1_p2_name, team_1_score, team_2_p1_name, team_2_p2_name, team_2_score
+                
+                # Find or create players by name
+                player_1 = find_or_create_player(row[:team_1_p1_name])
+                player_2 = find_or_create_player(row[:team_1_p2_name])
+                player_3 = find_or_create_player(row[:team_2_p1_name])
+                player_4 = find_or_create_player(row[:team_2_p2_name])
+                
+                played_at = begin
+                  Time.parse(row[:played_at])
+                rescue
+                  Time.now
+                end
+                
+                match_data = {
+                  played_at: played_at,
+                  team_1_p1_id: player_1[:id],
+                  team_1_p2_id: player_2[:id],
+                  team_1_score: row[:team_1_score].to_i,
+                  team_2_p1_id: player_3[:id],
+                  team_2_p2_id: player_4[:id],
+                  team_2_score: row[:team_2_score].to_i,
+                  status: 'completed'
+                }
+
+                match = repo.create(match_data)
+                EuchreCamp::Jobs::CalculateEloJob.perform_later(match[:id])
+                matches_created += 1
+                
+              rescue => e
+                errors << "Row #{row}: #{e.message}"
+              end
+            end
+
+            response.flash[:message] = "Created #{matches_created} matches.#{' Errors: ' + errors.join(', ') if errors.any?}"
+            response.redirect_to("/admin/matches")
+          end
+
+          private
+
+          def find_or_create_player(name)
+            rom = EuchreCamp::App["persistence.rom"]
+            return nil unless name
+            
+            name = name.strip
+            player = rom.relations[:players].where(name: name).one
+            
+            if player
+              player
+            else
+              rom.relations[:players].insert(name: name, rating: 0, current_elo: 1000)
+              rom.relations[:players].where(name: name).one
+            end
+          end
+        end
+      end
+    end
+  end
+end