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/Compat2018/Room2018Mapper.cs

@@ -0,0 +1,43 @@
+using DorkNet.Models.Rooms;
+using DorkNet.Server.Data.Entities;
+
+namespace DorkNet.Server.Compat2018;
+
+/// <summary>
+/// Maps a <see cref="RoomEntity"/> to the flat June-2018 wire room
+/// (<see cref="Room2018"/>). Server-side because DorkNet.Models can't reference
+/// the data entity. Some 2018 fields have no column (Instanced, MaxPlayers,
+/// ReportCount, ActivityLevelId) and get sensible defaults; IsSandbox is derived
+/// from IsAGRoom (official AG rooms are not sandbox/maker rooms).
+/// </summary>
+public static class Room2018Mapper
+{
+    public static Room2018 From(RoomEntity r) => new()
+    {
+        RoomId = r.Id,
+        Name = r.Name,
+        Description = r.Description,
+        CreatorPlayerId = r.CreatorPlayerId,
+        ImageName = r.ImageName,
+        DataBlobName = r.CurrentDataBlobName ?? string.Empty,
+        ActivityLevelId = string.Empty,
+        IsSandbox = !r.IsAGRoom,
+        Instanced = true,
+        MaxPlayers = 20,
+        Accessibility = r.Accessibility,
+        AccessibilityLocked = false,
+        VisitorCount = r.VisitorCount,
+        VisitCount = r.VisitCount,
+        CheerCount = r.CheerCount,
+        ReportCount = 0,
+        State = r.State,
+        StateModifiedAt = r.UpdatedAt,
+        CreatedAt = r.CreatedAt,
+        ModifiedAt = r.UpdatedAt,
+        LastVisitedAt = r.UpdatedAt,
+        DataModifiedAt = r.UpdatedAt,
+        CoOwners = [],
+        Hosts = [],
+        PersonalDetails = null,
+    };
+}