move anchor config to frontend dropdowns + localStorage, remove /api/settings

Program.cs

@@ -15,14 +15,6 @@ var app = builder.Build();
 app.UseDefaultFiles();
 app.UseStaticFiles();
 
-// GET /api/settings
-app.MapGet("/api/settings", (IConfiguration config) =>
-{
-    var anchorDay = int.TryParse(config["AnchorDay"], out var d) ? d : 0;
-    var anchorHour = int.TryParse(config["AnchorHour"], out var h) ? h : 0;
-    return Results.Ok(new { anchorDay, anchorHour });
-});
-
 // GET /api/cost-buckets?from=&to=&bucketMinutes=
 // Returns N buckets of aggregated cost
 app.MapGet("/api/cost-buckets", (Func<SqliteConnection> factory, string from, string to, int bucketMinutes) =>