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/Avatar/V3/AvatarSavedOutfitsController.cs

@@ -26,6 +26,7 @@ public class AvatarSavedOutfitsController(DorkNetDbContext db) : ControllerBase
 {
     private const int MaxSlots = 20;
 
+    [HttpGet("api/avatar/v1/saved")]
     [HttpGet("api/avatar/v2/saved")]
     [HttpGet("api/avatar/v3/saved")]
     [HttpGet("api/avatar/v4/saved")]
@@ -39,6 +40,7 @@ public class AvatarSavedOutfitsController(DorkNetDbContext db) : ControllerBase
 
     /// <summary>POST <c>v3/saved/set</c> — upsert one outfit by Slot.
     /// Body is the SavedOutfit shape directly.</summary>
+    [HttpPost("api/avatar/v1/saved/set")]
     [HttpPost("api/avatar/v3/saved/set")]
     [HttpPost("api/avatar/v2/saved/set")]
     public async Task<IActionResult> Set([FromBody] SavedOutfitDto body)