Very interesting! Thank you for sharing your project!!
However, in terms of some of the benefits you mention in the "motivations", bandwidth, energy efficiency and CO2 might weak points: after all your server (backend) stays on 24/7 and it does all the heavy lifting anyway, doesn't it? So you are not really saving bandwidth/energy/CO2... (unless - of course - you cache in "time" and "space" and reuse the search results for queries of yours and of other users).