Database / Session integrations

## Specific Demand

Currently dioxus fullstack requires [a lot of boilerplate](https://github.com/DioxusLabs/dioxus/tree/9ae3d14e676c90c73a99f5cfb41ff85c7cbf4bc2/packages/fullstack/examples/axum-auth) to set up a database. Dioxus should provide integration for different databases that make it easier to get started with storage

## Implement Suggestion

There are a few different directions we could go here:
- Choose a specific database like [surrealdb](https://surrealdb.com/) and create a very high quality rust and dioxus integration provides a type safe interface with a simpler template/API to get started with the database
- Support multiple adapters for different databases like the old approach to fullstack with a trait
- Create higher quality templates for different databases without a new library

Start with the fullstack/examples/axum-auth example to measure the database setup boilerplate. Compare the three proposed directions—SurrealDB integration, multiple adapters, or improved templates—and seek agreement on one scope before coding. Done means the chosen approach provides a documented, simpler database setup for Dioxus fullstack.

Written by the indexing model from the issue text.