Add endpoint to serve legacy Gooya audio files from PVC

Implement a new API endpoint to retrieve audio files based on episode ID, checking multiple potential file paths. This allows for serving existing audio files without re-downloading them, enhancing the efficiency of audio retrieval.

src/TafsirQuran.Api/Endpoints/TafsirEndpoints.cs

@@ -220,6 +220,31 @@ public static class TafsirEndpoints
             return Results.File(path, "audio/mpeg", enableRangeProcessing: true);
         });
 
+        // Legacy Gooya files already on PVC
+        group.MapGet("/audio/{episodeId:guid}", async (
+            Guid episodeId, AppDbContext db, IConfiguration config, IWebHostEnvironment env, CancellationToken ct) =>
+        {
+            var episode = await db.Episodes.AsNoTracking().FirstOrDefaultAsync(e => e.Id == episodeId, ct);
+            if (episode is null) return Results.NotFound();
+
+            var audioRoot = config["AudioRoot"] ?? "/data/audio";
+            var relative = episode.AudioUrl.TrimStart('/').Replace('\\', '/');
+            var candidates = new[]
+            {
+                Path.Combine(audioRoot, relative),
+                Path.Combine(env.ContentRootPath, "wwwroot", relative),
+                Path.Combine(env.ContentRootPath, "wwwroot", "audio", Path.GetFileName(relative))
+            };
+
+            foreach (var path in candidates)
+            {
+                if (File.Exists(path))
+                    return Results.File(path, "audio/mpeg", enableRangeProcessing: true);
+            }
+
+            return Results.NotFound();
+        });
+
         return group;
     }
 }