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/Controllers/API/Messages/V2/MessagesController.cs

@@ -92,6 +92,7 @@ public class MessagesController(
     /// scope every delete to <c>RecipientPlayerId == Me</c> so the
     /// sender can't unsend.</summary>
     [HttpPost("/api/messages/v3/delete")]
+    [HttpPost("/api/messages/v2/delete")]
     [HttpPost("/api/messages/v1/delete")]
     [Consumes("application/json")]
     public async Task<IActionResult> DeleteJson([FromBody] DeleteRequest body)
@@ -105,6 +106,7 @@ public class MessagesController(
     }
 
     [HttpPost("/api/messages/v3/delete")]
+    [HttpPost("/api/messages/v2/delete")]
     [HttpPost("/api/messages/v1/delete")]
     [Consumes("application/x-www-form-urlencoded", "multipart/form-data")]
     public async Task<IActionResult> DeleteForm(