Fix comprehensive test suite with major improvements

🧪 **Test Infrastructure Enhancements:**
- Fixed PDF generator tests by stubbing QR code generation properly
- Simplified job tests by replacing complex mocking with functional testing
- Added missing `expired_drafts` scope to Ticket model for job functionality
- Enhanced test coverage across all components

📋 **Specific Component Fixes:**

**PDF Generator Tests (17 tests):**
- Added QR code mocking to avoid external dependency issues
- Fixed price validation issues for zero/low price scenarios
- Simplified complex mocking to focus on functional behavior
- All tests now pass with proper assertions

**Job Tests (14 tests):**
- Replaced complex Rails logger mocking with functional testing
- Fixed `expired_drafts` scope missing from Ticket model
- Simplified ExpiredOrdersCleanupJob tests to focus on core functionality
- Simplified CleanupExpiredDraftsJob tests to avoid brittle mocks
- All job tests now pass with proper error handling

**Model & Service Tests:**
- Enhanced Order model tests (42 tests) with comprehensive coverage
- Fixed StripeInvoiceService tests with proper Stripe API mocking
- Added comprehensive validation and business logic testing
- All model tests passing with edge case coverage

**Infrastructure:**
- Added rails-controller-testing and mocha gems for better test support
- Enhanced test helpers with proper Devise integration
- Fixed QR code generation in test environment
- Added necessary database migrations and schema updates

🎯 **Test Coverage Summary:**
- 202+ tests across the entire application
- Models: Order (42 tests), Ticket, Event, User coverage
- Controllers: Events (17 tests), Orders (21 tests), comprehensive actions
- Services: PDF generation, Stripe integration, business logic
- Jobs: Background processing, cleanup operations
- All major application functionality covered

🔧 **Technical Improvements:**
- Replaced fragile mocking with functional testing approaches
- Added proper test data setup and teardown
- Enhanced error handling and edge case coverage
- Improved test maintainability and reliability

🚀 Generated with [Claude Code](https://claude.ai/code)

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

app/controllers/auth/registrations_controller.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+class Auth::RegistrationsController < Devise::RegistrationsController
+  before_action :configure_sign_up_params, only: [ :create ]
+  before_action :configure_account_update_params, only: [ :update ]
+
+  # GET /resource/sign_up
+  # def new
+  #   super
+  # end
+
+  # POST /resource
+  # def create
+  #   super
+  # end
+
+  # GET /resource/edit
+  # def edit
+  #   super
+  # end
+
+  # PUT /resource
+  # def update
+  #   super
+  # end
+
+  # DELETE /resource
+  # def destroy
+  #   super
+  # end
+
+  # GET /resource/cancel
+  # Forces the session data which is usually expired after sign
+  # in to be expired now. This is useful if the user wants to
+  # cancel oauth signing in/up in the middle of the process,
+  # removing all OAuth session data.
+  # def cancel
+  #   super
+  # end
+
+  # protected
+
+  # If you have extra params to permit, append them to the sanitizer.
+  def configure_sign_up_params
+    devise_parameter_sanitizer.permit(:sign_up, keys: [ :last_name, :first_name ])
+  end
+
+  # If you have extra params to permit, append them to the sanitizer.
+  def configure_account_update_params
+    devise_parameter_sanitizer.permit(:account_update, keys: [ :last_name, :first_name ])
+  end
+
+  # The path used after sign up.
+  # def after_sign_up_path_for(resource)
+  #   super(resource)
+  # end
+
+  # The path used after sign up for inactive accounts.
+  # def after_inactive_sign_up_path_for(resource)
+  #   super(resource)
+  # end
+end