Add Spotify lyrics test endpoint

- Add GET /api/admin/lyrics/spotify/test endpoint
- Accepts trackId query parameter (Spotify track ID)
- Returns lyrics in both JSON and LRC format
- Useful for testing Spotify lyrics API integration

allstarr/Controllers/AdminController.cs

@@ -2891,6 +2891,74 @@ public class AdminController : ControllerBase
         }
     }
     
+    /// <summary>
+    /// Test Spotify lyrics API by fetching lyrics for a specific Spotify track ID
+    /// Example: GET /api/admin/lyrics/spotify/test?trackId=3yII7UwgLF6K5zW3xad3MP
+    /// </summary>
+    [HttpGet("lyrics/spotify/test")]
+    public async Task<IActionResult> TestSpotifyLyrics([FromQuery] string trackId)
+    {
+        if (string.IsNullOrEmpty(trackId))
+        {
+            return BadRequest(new { error = "trackId parameter is required" });
+        }
+        
+        try
+        {
+            var spotifyLyricsService = _serviceProvider.GetService<allstarr.Services.Lyrics.SpotifyLyricsService>();
+            
+            if (spotifyLyricsService == null)
+            {
+                return StatusCode(500, new { error = "Spotify lyrics service not available" });
+            }
+            
+            _logger.LogInformation("Testing Spotify lyrics for track ID: {TrackId}", trackId);
+            
+            var result = await spotifyLyricsService.GetLyricsByTrackIdAsync(trackId);
+            
+            if (result == null)
+            {
+                return NotFound(new 
+                { 
+                    error = "No lyrics found",
+                    trackId,
+                    message = "Lyrics may not be available for this track, or the Spotify API is not configured correctly"
+                });
+            }
+            
+            return Ok(new
+            {
+                success = true,
+                trackId = result.SpotifyTrackId,
+                syncType = result.SyncType,
+                lineCount = result.Lines.Count,
+                language = result.Language,
+                provider = result.Provider,
+                providerDisplayName = result.ProviderDisplayName,
+                lines = result.Lines.Select(l => new
+                {
+                    startTimeMs = l.StartTimeMs,
+                    endTimeMs = l.EndTimeMs,
+                    words = l.Words
+                }).ToList(),
+                // Also show LRC format
+                lrcFormat = string.Join("\n", result.Lines.Select(l =>
+                {
+                    var timestamp = TimeSpan.FromMilliseconds(l.StartTimeMs);
+                    var mm = (int)timestamp.TotalMinutes;
+                    var ss = timestamp.Seconds;
+                    var ms = timestamp.Milliseconds / 10;
+                    return $"[{mm:D2}:{ss:D2}.{ms:D2}]{l.Words}";
+                }))
+            });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to test Spotify lyrics for track {TrackId}", trackId);
+            return StatusCode(500, new { error = $"Failed to fetch lyrics: {ex.Message}" });
+        }
+    }
+    
     /// <summary>
     /// Prefetch lyrics for a specific playlist
     /// </summary>