Refactor configuration and scripts for Archipelago backend and ISO build

- Updated Cargo.toml to remove unnecessary package backtrace optimizations.
- Changed default bind host and port in config.rs for broader accessibility.
- Renamed state_manager to _state_manager in server.rs for clarity.
- Updated user field to _user in PodmanClient and DockerRuntime for consistency.
- Modified build-debian-iso.sh to enhance welcome message and backend startup instructions.
- Improved archipelago-menu.sh to display backend status and updated Web UI URL.
- Enhanced install-to-disk.sh for better package management and user creation during installation.

core/container/src/podman_client.rs

@@ -49,14 +49,14 @@ impl From<&str> for ContainerState {
 }
 
 pub struct PodmanClient {
-    user: String,
+    _user: String,
     rootless: bool,
 }
 
 impl PodmanClient {
     pub fn new(user: String) -> Self {
         Self {
-            user,
+            _user: user,
             rootless: true,
         }
     }