fix(3c-ii): filter autocomplete by typed input + pin wipe handler in reg test

Address final whole-branch review minors: ServerAutocompleteHandler now
filters the guild's servers by the user's in-progress text (case-insensitive)
before the 25-cap, so a server past the 25th alphabetically is reachable;
CommandRegistrationTests now asserts the 'wipe' handler is registered (the
count tripwire alone wouldn't catch a rename of the newly-surfaced /wipe).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: HandyS11

src/RustPlusBot.Features.Commands/Servers/ServerAutocompleteHandler.cs

@@ -23,12 +23,15 @@ public override async Task<AutocompletionResult> GenerateSuggestionsAsync(
             return AutocompletionResult.FromSuccess();
         }
 
+        var typed = autocompleteInteraction.Data.Current.Value as string;
         var scope = services.CreateAsyncScope();
         await using (scope.ConfigureAwait(false))
         {
             var servers = scope.ServiceProvider.GetRequiredService<IServerService>();
             var known = await servers.ListAsync(context.Guild.Id).ConfigureAwait(false);
             var results = known
+                .Where(s => string.IsNullOrEmpty(typed) ||
+                            s.Name.Contains(typed, StringComparison.OrdinalIgnoreCase))
                 .Take(25)
                 .Select(s => new AutocompleteResult(s.Name, s.Id.ToString()));
             return AutocompletionResult.FromSuccess(results);

tests/RustPlusBot.Features.Commands.Tests/CommandRegistrationTests.cs

@@ -48,6 +48,7 @@ public void Dispatcher_and_handlers_resolve()
         Assert.Contains(handlers, h => h.Name == "mute");
         Assert.Contains(handlers, h => h.Name == "pop");
         Assert.Contains(handlers, h => h.Name == "time");
+        Assert.Contains(handlers, h => h.Name == "wipe");
         Assert.Contains(handlers, h => h.Name == "online");
         Assert.Contains(handlers, h => h.Name == "offline");
         Assert.Contains(handlers, h => h.Name == "team");