Refactor header key format in multiple analyst classes to use 'x_api_key' instead of 'x-api-key'

Refactor Marketplace response handling; simplify text extraction and update output method in output.py

Refactor Amazon and eBay classes to implement marketplace questionnaires; update session state management and input handling in response marketplace.

Refactor marketplace data retrieval to separate Amazon and eBay responses; update analysis handler to use the correct model.

Integrate Client Summary into multiple response classes

Add Marketplace class for handling product analysis and data fetching