OPC # 0001: Extract Clarity into standalone repo

Clarity.Server/Data/SysParams.cs

@@ -0,0 +1,12 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Clarity.Server.Data
+{
+    public class SysParams
+    {
+        [Key]
+        public int Id { get; set; } = 1;
+
+        public string EncryptedKek { get; set; } = string.Empty;
+    }
+}