Fix authorization: use secret_key_base directly (Rails.application.secrets removed in Rails 7.2)

Rails.application.secrets was deprecated in Rails 7.1 and removed in 7.2,
causing a NoMethodError on every ActionCable auth request → 401 Unauthorized.
Use Rails.application.secret_key_base which works across all Rails 7.x versions.

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

Author: princejoseph

ruby/hyper-operation/lib/hyper-operation/transport/hyperstack.rb

@@ -153,7 +153,7 @@ def self.channel
   end
 
   def self.authorization(salt, channel, session_id)
-    secret_key = Rails.application.secrets[:secret_key_base]
+    secret_key = Rails.application.secret_key_base
     Digest::SHA1.hexdigest(
       "salt: #{salt}, channel: #{channel}, session_id: #{session_id}, secret_key: #{secret_key}"
     )