Introduce model/ and repository/ structure under lib/

Models: Message, WikiPage, Game (typed structs instead of raw hashes)
Repositories: MessageBoard, OnlineUsers, WikiClient, CatalogClient
bbs.rb uses attribute access (page.title, game.play_path, …) throughout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/model/game.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class Game
+  attr_reader :title, :platform, :author, :desc,
+              :play_path, :download_path, :source_path, :docs_path,
+              :release_count
+
+  def initialize(entry)
+    sw     = entry['software']      || {}
+    latest = entry['latestRelease'] || {}
+    @title         = sw['title'].to_s
+    @platform      = sw['platform'].to_s
+    @author        = sw['author'].to_s
+    @desc          = sw['desc'].to_s
+    @play_path     = latest['htmlFolderPath'].to_s
+    @download_path = latest['cartridgePath'].to_s
+    @source_path   = latest['sourcePath'].to_s
+    @docs_path     = latest['docsFolderPath'].to_s
+    @release_count = (entry['releases'] || []).length
+  end
+end

lib/model/message.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+Message = Struct.new(:timestamp, :username, :text)

lib/model/wiki_page.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+WikiPage = Struct.new(:id, :path, :title, :description, :created_at, :locale, keyword_init: true)