add random match-making logic

main-server/app/controllers/api/matchmaking_controller.rb

@@ -0,0 +1,21 @@
+class Api::MatchmakingController < ApplicationController
+  def create
+    result = MatchmakingService.find_match(current_user.id)
+
+    if result
+      render json: {
+        match_id: result[:match_id],
+        game_token: result[:game_token],
+        game_server: result[:game_server],
+        players: result[:players]
+      }
+    else
+      render json: { error: "No opponent found. Try again." }, status: :request_timeout
+    end
+  end
+
+  def destroy
+    MatchmakingService.cancel(current_user.id)
+    render json: { message: "Matchmaking cancelled" }
+  end
+end