feat(apiv2): reorganize controllers, add stats to meta endpoint

PluralKit.API/Controllers/v2/PrivateControllerV2.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Mvc;
+
+using Newtonsoft.Json.Linq;
+
+namespace PluralKit.API
+{
+    [ApiController]
+    [ApiVersion("2.0")]
+    [Route("v{version:apiVersion}")]
+    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);
+        }
+    }
+}