feat: Add support for 2018 client API endpoints and data models

- Implemented new search endpoints for rooms to accommodate the 2018 client.
- Added support for retrieving room details and featured rooms in a format compatible with the 2018 client.
- Introduced new data models for login responses and player presence specific to the 2018 client.
- Created mappers to convert between internal entities and the 2018 wire formats for players and rooms.
- Updated existing storefront APIs to include versioned endpoints for the 2018 client.
- Enhanced the version controller to return dual-format responses for compatibility with both 2018 and 2020 clients.
- Refactored the configuration service to ensure trailing slashes in URLs for the 2018 client.

DorkNet.Server/Services/PlayerService.cs

@@ -632,6 +632,15 @@ public class PlayerService(DorkNetDbContext db, RoomService rooms, ILogger<Playe
     public async Task<PlayerEntity?> GetByIdAsync(long id) =>
         await db.Players.Include(p => p.Avatar).FirstOrDefaultAsync(p => p.Id == id);
 
+    /// <summary>Bulk profile fetch for the 2018 client's batch resolvers
+    /// (api/players/v1/list, presence). Single query; order is not guaranteed.</summary>
+    public async Task<List<PlayerEntity>> GetByIdsAsync(IEnumerable<long> ids)
+    {
+        var idList = ids.Distinct().ToList();
+        if (idList.Count == 0) return [];
+        return await db.Players.Where(p => idList.Contains(p.Id)).ToListAsync();
+    }
+
     /// <summary>
     /// Stamp the calling platform onto an existing account so the
     /// next boot's <c>/cachedlogin/forplatformid</c> query finds it.