Remove comments from backend and web-player source

Strip //, /* */ and XML doc comments from all backend .cs files, and
JS/TS/CSS/HTML comments from web-player source (.ts, .svelte, .css),
per the project's no-comments convention.

backend/Hosts/Musify.Api/Authentication/JwtBearerEventsHandler.cs

@@ -41,13 +41,8 @@ public sealed class JwtBearerEventsHandler(
         if (cache.TryGetValue(cacheKey, out _))
             return;
 
-        // Access tokens from the IdP are minimal (just sub/scope/aud) — profile attributes live on
-        // the userinfo endpoint, so ask for them there instead of relying on token claims alone.
         var userInfo = await FetchUserInfoAsync(tokenValidatedContext, tokenValidatedContext.HttpContext.RequestAborted);
 
-        // Zitadel also issues short-form JWT claim names ("name", "given_name", "family_name", "email"),
-        // but the newer JsonWebTokenHandler (default since .NET 8) no longer auto-maps those to the
-        // legacy ClaimTypes.* URIs the way JwtSecurityTokenHandler used to — so check both forms too.
         var username = userInfo?.Name
             ?? userInfo?.PreferredUsername
             ?? principal.FindFirstValue("name")

backend/Hosts/Musify.Api/OpenApi/OpenApiOptionsSetup.cs

@@ -39,13 +39,6 @@ public sealed class OpenApiOptionsSetup(IOptions<AuthenticationConfiguration> op
             return Task.CompletedTask;
         } );
 
-        // Properties annotated with [JsonConverter(typeof(LongAsStringConverter))] (id-shaped
-        // `long` fields — see that converter for why) serialize as a JSON string, but the
-        // schema generator still reflects the declared CLR `long`/`long?` type as a bare
-        // int64 number. Reconcile the declared schema so generated clients (openapi-typescript)
-        // type exactly those properties as `string`, matching what actually goes over the wire —
-        // scoped to the attribute, not the CLR type, so unrelated `long` fields (byte sizes, …)
-        // are left alone.
         options.AddSchemaTransformer((schema, context, _) =>
         {
             if (context.JsonPropertyInfo?.CustomConverter is LongAsStringConverter or NullableLongAsStringConverter)

backend/Hosts/Musify.Api/Program.cs

@@ -48,6 +48,4 @@ app
 
 app.Run();
 
-// Makes the top-level-statements Program class public so
-// WebApplicationFactory<Program> (Musify.Api.Tests) can see it.
 public partial class Program;