feat!: wishlist, upload-queue privilege recognition, and search filters (#20)

Closes the last two gaps in Soulseek's list of features an alternative client
must implement to be tolerated, and adds the result filters Nicotine+ has had
all along.

Wishlist: server code 103 is sent and code 104's announced interval is kept
rather than logged and discarded, so the re-search timer runs off the schedule
the server set. `wish add|remove|list|run` plus `serve --wishlist`; wishes
persist in config.toml as a TOML array so a comma inside a query survives.
`wish run` prints search-shaped records, so it pipes into `download --stdin`.

Privilege recognition: the code-69 user list is parsed instead of counted and
dropped, and code 92 answers `whoami` as `privilege_seconds`. Uploads now go
through a queue with a slot cap (`--upload-slots`, default 2) that serves
privileged users first — the cap is what makes the ordering mean anything, so
they are one change. `PlaceInQueueRequest` (peer code 51) is answered, where it
previously had no handler at all, and a departed peer's slot is released so a
stalled peer cannot wedge uploads shut.

Search filters: `--exclude`, `--extension`, `--min-size`, `--max-size` beside
the existing `--min-bitrate` and `--free-slots`, in one flattened arg group
shared by `search`, `get` and `wish run`.

Also serialises the library e2e suite behind the same gate `cli_e2e` already
uses: the new queue tests hold peer sockets open on purpose, which starved
concurrently-spawned soulfinds and failed unrelated download tests with
`login: Timeout`.

BREAKING CHANGE: `UploadStatus` gains a `Queued(u32)` variant, so an exhaustive
match on it no longer compiles, and `cli::Commands` gains `Wish`.

soulseek-rs/src/main.rs

@@ -8,7 +8,10 @@ mod port_mapping;
 mod ui;
 
 use clap::Parser;
-use cli::{Cli, Commands, ConfigCommand, SharesCommand, parse_server_address};
+use cli::{
+    Cli, Commands, ConfigCommand, SharesCommand, WishCommand,
+    parse_server_address,
+};
 use commands::Ctx;
 use output::{CliError, CliResult, Exit, Out};
 use soulseek_rs::{ClientSettings, ClientVersion, PeerAddress};
@@ -93,6 +96,15 @@ fn run(mut cli: Cli, out: &Out) -> CliResult {
         Commands::Shares(SharesCommand::Remove { ref directory }) => {
             return commands::settings::shares_remove(out, &store, directory);
         }
+        Commands::Wish(WishCommand::Add { ref query }) => {
+            return commands::wish::add(out, &store, query);
+        }
+        Commands::Wish(WishCommand::Remove { ref query }) => {
+            return commands::wish::remove(out, &store, query);
+        }
+        Commands::Wish(WishCommand::List) => {
+            return commands::wish::list(out, &store);
+        }
         _ => {}
     }
 
@@ -104,6 +116,22 @@ fn run(mut cli: Cli, out: &Out) -> CliResult {
         Commands::Shares(SharesCommand::Reindex) => {
             commands::settings::shares_reindex(&ctx)
         }
+        Commands::Wish(WishCommand::Run(ref args)) => {
+            commands::wish::run(&ctx, &store, args)
+        }
+        Commands::Serve(ref args) => {
+            let sweeper = args
+                .wishlist
+                .then(|| commands::wish::Sweeper::new(store.config.wishes()))
+                .flatten();
+            if args.wishlist && sweeper.is_none() {
+                out.warn(
+                    "--wishlist has nothing to look for; add one with \
+                          `wish add QUERY`",
+                );
+            }
+            commands::peer::serve(&ctx, args, sweeper)
+        }
         other => commands::run(&ctx, other),
     }
 }