backend: finish recommendation API

[divyamk]

• [x] Get answers to questions
• [ ] Check if "other" was a response for any question, if it was call the "other" response LLM - if one fails immediately return a response with which failed
• [x] Call Scraper for Filters and responses
• [x] Send question answers and scraped filters to LLM
• [x] Input the filter responses into the scraper
• [x] Scrape top products
• [ ] Return Keywords