✨ Quota and better drive dashboard

DysonNetwork.Drive/Billing/Quota.cs

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+using DysonNetwork.Shared.Data;
+using NodaTime;
+
+namespace DysonNetwork.Drive.Billing;
+
+/// <summary>
+/// The quota record stands for the extra quota that a user has.
+/// For normal users, the quota is 1GiB.
+/// For stellar program t1 users, the quota is 5GiB
+/// For stellar program t2 users, the quota is 10GiB
+/// For stellar program t3 users, the quota is 15GiB
+///
+/// If users want to increase the quota, they need to pay for it.
+/// Each 1NSD they paid for one GiB.
+///
+/// But the quota record unit is MiB, the minimal billable unit.
+/// </summary>
+public class QuotaRecord : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid AccountId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    
+    public long Quota { get; set; }
+    
+    public Instant? ExpiredAt { get; set; }
+}