feat: Stream Now instant-play of a random track from the nav button

DeepDrftPublic/Controllers/TrackProxyController.cs

@@ -59,6 +59,39 @@ public class TrackProxyController : ControllerBase
         }
     }
 
+    /// <summary>
+    /// Proxies the random-track metadata lookup from DeepDrftAPI. Unauthenticated, same posture as
+    /// the paged listing. Small JSON, buffered and relayed; a 404 from upstream (empty library)
+    /// passes through so the client renders it as a valid empty state. Declared before the
+    /// parameterized "{trackId}" route so the literal segment is never treated as a trackId.
+    /// </summary>
+    [HttpGet("random")]
+    public async Task<ActionResult> GetRandom(CancellationToken ct = default)
+    {
+        HttpResponseMessage upstream;
+        try
+        {
+            upstream = await _upstream.GetAsync("api/track/random", HttpCompletionOption.ResponseHeadersRead, ct);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Upstream call to DeepDrftAPI track/random failed");
+            return StatusCode(502, "Upstream unavailable");
+        }
+
+        using (upstream)
+        {
+            if (!upstream.IsSuccessStatusCode)
+            {
+                _logger.LogWarning("DeepDrftAPI track/random returned {Status}", (int)upstream.StatusCode);
+                return StatusCode((int)upstream.StatusCode);
+            }
+
+            var json = await upstream.Content.ReadAsStringAsync(ct);
+            return Content(json, "application/json");
+        }
+    }
+
     /// <summary>
     /// Proxies single-track metadata lookup by vault entry key from DeepDrftAPI. Unauthenticated,
     /// same posture as the paged listing. Small JSON, so it is buffered and relayed; a 404 from