Add linked suggestions with synced voting

Endpoints/ResultsEndpoints.cs

@@ -46,11 +46,47 @@ public static class ResultsEndpoints
                         s.GameUrl,
                         s.Description,
                         s.Genre,
+                        s.ParentSuggestionId
                     })
                     .OrderByDescending(r => r.Average)
                     .ToListAsync();
 
-                return Results.Ok(results);
+                var rootIndex = EndpointHelpers.BuildLinkRoots(results.Select(r => (r.Id, r.ParentSuggestionId)));
+                var nameLookup = results.ToDictionary(r => r.Id, r => r.Name);
+
+                var shaped = results.Select(r =>
+                {
+                    var linkedIds = EndpointHelpers.LinkedIdsFor(r.Id, rootIndex)
+                        .Where(id => id != r.Id)
+                        .ToList();
+
+                    return new
+                    {
+                        r.Id,
+                        r.Name,
+                        r.Author,
+                        r.MinPlayers,
+                        r.MaxPlayers,
+                        r.Total,
+                        r.Count,
+                        r.Average,
+                        r.Votes,
+                        r.MyVote,
+                        r.ScreenshotUrl,
+                        r.YoutubeUrl,
+                        r.GameUrl,
+                        r.Description,
+                        r.Genre,
+                        r.ParentSuggestionId,
+                        LinkedIds = linkedIds,
+                        LinkedTitles = linkedIds
+                            .Where(id => nameLookup.ContainsKey(id))
+                            .Select(id => nameLookup[id])
+                            .ToList()
+                    };
+                });
+
+                return Results.Ok(shaped);
             }
         );
     }