feat(api): separate private endpoints from public API versioning

PluralKit.API/Controllers/v2/PrivateControllerV2.cs

@@ -1,25 +0,0 @@
-using Microsoft.AspNetCore.Mvc;
-
-using Newtonsoft.Json.Linq;
-
-namespace PluralKit.API;
-
-[ApiController]
-[Route("v2")]
-public class PrivateControllerV2: PKControllerBase
-{
-    public PrivateControllerV2(IServiceProvider svc) : base(svc) { }
-
-    [HttpGet("meta")]
-    public async Task<ActionResult<JObject>> Meta()
-    {
-        var shards = await _repo.GetShards();
-        var stats = await _repo.GetStats();
-
-        var o = new JObject();
-        o.Add("shards", shards.ToJSON());
-        o.Add("stats", stats.ToJson());
-
-        return Ok(o);
-    }
-}