Initial commit

src/PowderCoating.Core/Entities/ContactSubmission.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Persisted record of a contact form submission. Inherits CompanyId from BaseEntity so
+/// company users can only see their own submissions; SuperAdmin sees all via IsPlatformAdmin filter.
+/// </summary>
+public class ContactSubmission : BaseEntity
+{
+    public string SenderName { get; set; } = string.Empty;
+    public string SenderEmail { get; set; } = string.Empty;
+    public string CompanyName { get; set; } = string.Empty;
+    public string Category { get; set; } = string.Empty;
+    public string Subject { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+
+    /// <summary>True once a SuperAdmin has opened/acknowledged the submission.</summary>
+    public bool IsRead { get; set; } = false;
+    public DateTime? ReadAt { get; set; }
+    public string? ReadByUserId { get; set; }
+    public string? ReadByUserName { get; set; }
+
+    /// <summary>Optional internal note added by SuperAdmin (e.g. "Replied via email 4/19").</summary>
+    public string? AdminNotes { get; set; }
+}