feat(revert): "feat: captain image support" (#11841)

Reverts chatwoot/chatwoot#11730

enterprise/app/services/captain/llm/assistant_chat_service.rb

@@ -12,16 +12,9 @@ class Captain::Llm::AssistantChatService < Llm::BaseOpenAiService
     register_tools
   end
 
-  # additional_message: A single message (String) from the user that should be appended to the chat.
-  #                    It can be an empty String or nil when you only want to supply historical messages.
-  # message_history:   An Array of already formatted messages that provide the previous context.
-  # role:              The role for the additional_message (defaults to `user`).
-  #
-  # NOTE: Parameters are provided as keyword arguments to improve clarity and avoid relying on
-  # positional ordering.
-  def generate_response(additional_message: nil, message_history: [], role: 'user')
-    @messages += message_history
-    @messages << { role: role, content: additional_message } if additional_message.present?
+  def generate_response(input, previous_messages = [], role = 'user')
+    @messages += previous_messages
+    @messages << { role: role, content: input } if input.present?
     request_chat_completion
   end