Decide on a guiding backend framework/solution

[Nyumat]

This decision depends on the outcome of issue #2 (native vs. cross-platform).

But or now, we need to evaluate backend options that align with our development strategy. Ideally, we should consider performance, scalability, ease of integration with the frontend, and long-term maintenance. Potential solutions include:

• Node.js (Express, NestJS)
• Django (Python)
• Firebase (Serverless)
• Supabase
• & More!

[owenkrause]

We decided on Express.js since most people were familiar with it.