Add /api/info endpoint for build time, title.js, UI tweaks

Endpoints/InfoEndpoint.cs

@@ -0,0 +1,42 @@
+using System;
+using System.IO;
+using System.Reflection;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Routing;
+
+namespace Gott.Endpoints;
+
+public static class InfoEndpoint
+{
+    public static void MapInfoEndpoint(this IEndpointRouteBuilder app)
+    {
+        app.MapGet("/api/info", HandleInfo);
+    }
+
+    private static IResult HandleInfo()
+    {
+        var assembly = Assembly.GetExecutingAssembly();
+        var location = assembly.Location;
+
+        long buildTime = 0;
+
+        if (!string.IsNullOrEmpty(location) && File.Exists(location))
+        {
+            var lastWrite = File.GetLastWriteTimeUtc(location);
+            buildTime = new DateTimeOffset(lastWrite).ToUnixTimeSeconds();
+        }
+        else
+        {
+            var dir = AppContext.BaseDirectory;
+            var exePath = Path.Combine(dir, "gott");
+            if (File.Exists(exePath))
+            {
+                var lastWrite = File.GetLastWriteTimeUtc(exePath);
+                buildTime = new DateTimeOffset(lastWrite).ToUnixTimeSeconds();
+            }
+        }
+
+        return Results.Json(new { buildTime });
+    }
+}