Expose connection info in fullstack

## Feature Request

I wanted to access the client's IP address within a server function. Axum provides this info via the [ConnectInfo](https://docs.rs/axum/0.8.8/axum/extract/connect_info/struct.ConnectInfo.html) extractor.

However, that requires calling [`.into_make_service_with_connect_info::()`](https://docs.rs/axum/0.8.8/axum/struct.Router.html#method.into_make_service_with_connect_info).
Dioxus only calls `.into_make_service`.
https://github.com/DioxusLabs/dioxus/blob/f717a8e184a522d078b70bb4b4d62a5f9a99ddfc/packages/fullstack-server/src/launch.rs#L147
https://github.com/DioxusLabs/dioxus/blob/f717a8e184a522d078b70bb4b4d62a5f9a99ddfc/packages/fullstack-server/src/launch.rs#L161

## Implement Suggestion

`serve_router` should accept the same type as `axum::serve`

## Additional info

Accessing a client's IP address has a lot of use-cases. Mine is checking which VPN client it is, as VPNs like Tailscale and Wireshark guarantee static IP addresses for the clients.

Start in packages/fullstack-server/src/launch.rs at the two linked locations, and compare the current .into_make_service usage with Axum's axum::serve and .into_make_service_with_connect_info::(). Trace how serve_router is defined and called. Done means server functions can access client connection information, including a client's IP address, without breaking existing fullstack server startup.

Written by the indexing model from the issue text.