feat(daemon): route commands and the TUI through a running daemon

Session::open attaches to a daemon when one is reachable and logs in
otherwise, so every existing command works unchanged against either. A local
socket is found automatically, which is what makes an agent's invocation need
no flags at all; --no-daemon opts out.

Commands now read identity, shares, server, and download directory from the
session rather than from this run's config: routed to a daemon those differ,
and the session is the one actually on the network. Without that, whoami
named the wrong server and shares reindex would have imposed the client
machine's folders on the daemon.

soulseek-rs/src/commands/peer.rs

@@ -24,7 +24,10 @@ pub fn whoami(ctx: &Ctx) -> CliResult {
     // reachable needs what is true, not what was asked for.
     let bound = session.client.listen_port();
     ctx.out.emit(&WhoamiRecord {
-        user: ctx.settings.username.clone(),
+        // The session's own name, not this run's configuration: routed to a
+        // daemon they are different, and the session is the one that is
+        // actually on the network.
+        user: session.client.username(),
         server: ctx.settings.server_address.to_string(),
         listening: bound.is_some(),
         listen_port: bound.unwrap_or(0),