feat: search documentation tool for reply suggestions (#13340)

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

enterprise/lib/enterprise/captain/reply_suggestion_service.rb

@@ -0,0 +1,24 @@
+module Enterprise::Captain::ReplySuggestionService
+  def make_api_call(model:, messages:, tools: [])
+    return super unless use_search_tool?
+
+    super(model: model, messages: messages, tools: [build_search_tool])
+  end
+
+  private
+
+  def use_search_tool?
+    ChatwootApp.chatwoot_cloud? || ChatwootApp.self_hosted_enterprise?
+  end
+
+  def prompt_variables
+    return super unless use_search_tool?
+
+    super.merge('has_search_tool' => true)
+  end
+
+  def build_search_tool
+    assistant = conversation&.inbox&.captain_assistant
+    Captain::Tools::SearchReplyDocumentationService.new(account: account, assistant: assistant)
+  end
+end