fix: Added authentication to FireCrawl API, remove unused RobinAI references (#10737)

- Fixed Firecrawl webhook payloads to ensure proper data handling and
delivery.
- Removed unused Robin AI code to improve codebase cleanliness and
maintainability.
- Implement authentication for the Firecrawl endpoint to improve
security. A key is generated to secure the webhook URLs from FireCrawl.

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/policies/response_source_policy.rb

@@ -1,17 +0,0 @@
-class ResponseSourcePolicy < ApplicationPolicy
-  def parse?
-    @account_user.administrator?
-  end
-
-  def create?
-    @account_user.administrator?
-  end
-
-  def add_document?
-    @account_user.administrator?
-  end
-
-  def remove_document?
-    @account_user.administrator?
-  end
-end