many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Memberships/Data/Membership.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Memberships.Data;
+
+public class Membership
+{
+    public Guid Id { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+    public Guid UserId { get; set; }
+    public Guid CreatorId { get; set; }
+    public Guid TierId { get; set; }
+    public MembershipTier? MembershipTier { get; set; }
+    public MembershipState State { get; set; }
+    public DateTimeOffset? StartDate { get; set; }
+    public DateTimeOffset? EndDate { get; set; }
+    public bool IsActive => EndDate == null || EndDate > DateTimeOffset.UtcNow;
+    [MaxLength(256)]public string? StripeSubscriptionId { get; set; }
+    
+    public ICollection<Payment> Payments { get; set; } = [];
+}

backend/Modules/Memberships/Data/MembershipState.cs

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+namespace Hutopy.Modules.Memberships.Data;
+
+public enum MembershipState
+{
+    Pending,
+    Active,
+    Inactive
+}

backend/Modules/Memberships/Data/MembershipTier.cs

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+using System.ComponentModel.DataAnnotations;
+using Hutopy.Common.Domain;
+
+namespace Hutopy.Modules.Memberships.Data;
+
+public class MembershipTier : Entity
+{
+    public Guid CreatorId { get; set; }
+    [MaxLength(128)] public string Name { get; set; } = null!;
+    [MaxLength(4096)] public string Description { get; set; } = null!;
+    public decimal Price { get; set; }
+    [MaxLength(128)] public string CurrencyCode { get; set; } = null!;
+    [MaxLength(128)] public string StripeProductId { get; set; } = null!;
+    [MaxLength(128)] public string StripePriceId { get; set; } = null!;
+
+    public ICollection<Membership> Subscriptions { get; set; } = [];
+}

backend/Modules/Memberships/Data/MembershipsDbContext.cs

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+namespace Hutopy.Modules.Memberships.Data;
+
+public sealed class MembershipsDbContext(
+    DbContextOptions<MembershipsDbContext> options)
+    : DbContext(options)
+{
+    public const string SchemaName = "Memberships";
+
+    public DbSet<MembershipTier> MembershipTiers => Set<MembershipTier>();
+    public DbSet<Membership> Memberships => Set<Membership>();
+    public DbSet<Payment> Payments => Set<Payment>();
+    
+    
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.HasDefaultSchema(SchemaName);
+
+        modelBuilder
+            .Entity<MembershipTier>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+        
+        modelBuilder
+            .Entity<Membership>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+        modelBuilder
+            .Entity<Payment>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+    }
+}

backend/Modules/Memberships/Data/Payment.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Memberships.Data;
+
+public class Payment
+{
+    public Guid Id { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+    public decimal Amount { get; set; }
+    [MaxLength(8)] public required string Currency { get; set; }
+    [MaxLength(2048)] public required string InvoiceUrl { get; set; }
+    
+}