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

feat(emailer): add Postmark and Resend providers

backend/Modules/Creators/Data/Creator.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Creators.Data;
+
+public class Creator
+{
+    public Guid Id { get; set; }
+    
+    public Guid CreatedBy { get; set; } 
+    public DateTimeOffset CreatedAt { get; init; }   
+    public Guid? DeletedBy { get; set; }
+    public DateTimeOffset? DeletedAt { get; set; }
+    
+    /// <summary>
+    /// Soft‑delete flag (false by default, true once DeletedAt is set)
+    /// </summary>
+    public bool IsDeleted { get; private set; }   // private set → EF updates it
+
+    [MaxLength(2048)] public string? BannerUrl { get; set; }
+    [MaxLength(2048)] public string? PortraitUrl { get; set; }
+    public bool Verified { get; set; }
+    [MaxLength(256)] public required string Name { get; set; }
+    [MaxLength(128)] public required string Slug { get; set; }
+    [MaxLength(256)] public string? Title { get; set; }
+
+    [MaxLength(21)] public string? StripeAccountId { get; set; }
+    public bool IsStripeDetailsSubmitted { get; set; }
+    public bool IsStripePayoutReady { get; set; }
+    public bool IsStripeChargesEnabled { get; set; }
+    public Socials Socials { get; set; } = new();
+    public Presentation Presentation { get; set; } = new() { Description = "Welcome to my profile!" };
+}

backend/Modules/Creators/Data/CreatorsDbContext.cs

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+namespace Hutopy.Modules.Creators.Data;
+
+public class CreatorsDbContext(
+    DbContextOptions<CreatorsDbContext> options)
+    : DbContext(options)
+{
+    public const string SchemaName = "Creators";
+
+    public DbSet<Creator> Creators => Set<Creator>();
+    public DbSet<Slugs> Slugs => Set<Slugs>();
+
+    protected override void OnModelCreating(
+        ModelBuilder modelBuilder)
+    {
+        modelBuilder.HasDefaultSchema(SchemaName);
+
+        modelBuilder
+            .Entity<Slugs>()
+            .Property(x => x.NormalizedName)
+            .HasComputedColumnSql("LOWER(\"Name\")", stored: true);
+
+        modelBuilder
+            .Entity<Slugs>()
+            .HasIndex(x => x.NormalizedName)
+            .IsUnique();
+
+        modelBuilder
+            .Entity<Creator>()
+            .Property(c => c.IsDeleted)
+            .HasComputedColumnSql("\"DeletedAt\" IS NOT NULL", stored: true); // bool
+
+        modelBuilder
+            .Entity<Creator>()
+            .OwnsOne<Socials>(x => x.Socials)
+            .ToTable(nameof(Socials));
+
+        modelBuilder
+            .Entity<Creator>()
+            .OwnsOne<Presentation>(x => x.Presentation)
+            .ToTable(nameof(Presentation));
+        
+        modelBuilder
+            .Entity<Creator>()
+            .HasQueryFilter(c => !c.IsDeleted);
+    }
+}

backend/Modules/Creators/Data/Presentation.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Creators.Data;
+
+public class Presentation
+{
+    public string Description { get; set; } = null!;
+    [MaxLength(2048)] public string? VideoUrl { get; set; }
+    [MaxLength(256)] public string? PhoneNumber { get; set; }
+    [MaxLength(256)] public string? Email { get; set; }
+}

backend/Modules/Creators/Data/Slugs.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Creators.Data;
+
+public class Slugs
+{
+    public Guid Id { get; set; }
+    public Guid CreatedBy { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+    public Guid? UsedBy { get; set; }
+    [MaxLength(128)] public string Name { get; set; } = null!;
+    [MaxLength(128)] public string NormalizedName { get; set; } = null!;
+    public DateTimeOffset ReservedUntil { get; set; }
+}

backend/Modules/Creators/Data/Socials.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Modules.Creators.Data;
+
+public class Socials
+{
+    [MaxLength(2048)] public string? FacebookUrl { get; set; }
+    [MaxLength(2048)] public string? InstagramUrl { get; set; }
+    [MaxLength(2048)] public string? XUrl { get; set; }
+    [MaxLength(2048)] public string? LinkedInUrl { get; set; }
+    [MaxLength(2048)] public string? TikTokUrl { get; set; }
+    [MaxLength(2048)] public string? YoutubeUrl { get; set; }
+    [MaxLength(2048)] public string? RedditUrl { get; set; }
+    [MaxLength(2048)] public string? WebsiteUrl { get; set; }
+}