feat: Add standalone mode support

- Create DemoUser migration for standalone development
- Add DemoUser model with polymorphic games association
- Add configuration system (standalone vs mounted)
- Use ENV variables for configuration
- current_player method supports both modes (ApplicationController)
- Can run without Hacktivity for development

app/models/break_escape/demo_user.rb

@@ -0,0 +1,18 @@
+module BreakEscape
+  class DemoUser < ApplicationRecord
+    self.table_name = 'break_escape_demo_users'
+
+    has_many :games, as: :player, class_name: 'BreakEscape::Game'
+
+    validates :handle, presence: true, uniqueness: true
+
+    # Mimic User role methods
+    def admin?
+      role == 'admin'
+    end
+
+    def account_manager?
+      role == 'account_manager'
+    end
+  end
+end

config/initializers/break_escape.rb

@@ -0,0 +1,9 @@
+# BreakEscape Engine Configuration
+BreakEscape.configure do |config|
+  # Set to true for standalone mode (development)
+  # Set to false when mounted in Hacktivity (production)
+  config.standalone_mode = ENV['BREAK_ESCAPE_STANDALONE'] == 'true'
+
+  # Demo user handle for standalone mode
+  config.demo_user_handle = ENV['BREAK_ESCAPE_DEMO_USER'] || 'demo_player'
+end

db/migrate/20251120160000_create_break_escape_demo_users.rb

@@ -0,0 +1,12 @@
+class CreateBreakEscapeDemoUsers < ActiveRecord::Migration[7.0]
+  def change
+    create_table :break_escape_demo_users do |t|
+      t.string :handle, null: false
+      t.string :role, default: 'user', null: false
+
+      t.timestamps
+    end
+
+    add_index :break_escape_demo_users, :handle, unique: true
+  end
+end

lib/break_escape.rb

@@ -2,5 +2,28 @@ require "break_escape/version"
 require "break_escape/engine"
 
 module BreakEscape
-  # Your code goes here...
+  class << self
+    attr_accessor :configuration
+  end
+
+  def self.configure
+    self.configuration ||= Configuration.new
+    yield(configuration) if block_given?
+  end
+
+  def self.standalone_mode?
+    configuration&.standalone_mode || false
+  end
+
+  class Configuration
+    attr_accessor :standalone_mode, :demo_user_handle
+
+    def initialize
+      @standalone_mode = false
+      @demo_user_handle = 'demo_player'
+    end
+  end
 end
+
+# Initialize with defaults
+BreakEscape.configure {}