Initial commit: SWP.Core enterprise framework with multi-tenant architecture, configuration management, security, telemetry and comprehensive test suite

Core/CommandQueries/Command.cs

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+namespace SWP.Core.CommandQueries;
+
+public abstract class Command : ICommand
+{
+    public required Guid CorrelationId { get; set; }
+    public Guid TransactionId { get; set; }
+}

Core/CommandQueries/CommandResponse.cs

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+namespace SWP.Core.CommandQueries;
+
+/// <summary>
+/// Represents a response to a command request
+/// This class includes details such as a unique request ID, correlation ID, command name,
+/// transaction ID, creation timestamp, and a URL to check the status of the command.
+/// </summary>
+/// <param name="correlationId">A unique identifier used to track the request across services.</param>
+/// <param name="commandName">The name of the command being executed.</param>
+/// <param name="transactionId">An optional unique identifier for the transaction associated with the command.</param>
+public class CommandResponse(Guid correlationId, string commandName, Guid? transactionId)
+{
+    /// <summary>
+    /// A unique identifier for the request. This is automatically generated using Guid.CreateVersion7().
+    /// </summary>
+    public Guid RequestId { get; } = Guid.CreateVersion7();
+
+    /// <summary>
+    /// A unique identifier used to track the request across services. This is provided when creating the response.
+    /// </summary>
+    public Guid CorrelationId { get; } = correlationId;
+
+    /// <summary>
+    /// The name of the command being executed.
+    /// </summary>
+    public string CommandName { get; } = commandName;
+
+    /// <summary>
+    /// An optional unique identifier for the transaction associated with the command.
+    /// </summary>
+    public Guid? TransactionId { get; } = transactionId;
+
+    /// <summary>
+    /// The timestamp when the command response was created. This is automatically set to the current UTC time.
+    /// </summary>
+    public DateTime CreatedAt { get; } = DateTime.UtcNow;
+
+    /// <summary>
+    /// A URL where the client can check the status of the command. This is typically used in asynchronous operations.
+    /// </summary>
+    public string StatusUrl { get; } = "statusUrl";
+}

Core/CommandQueries/ICommand.cs

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+namespace SWP.Core.CommandQueries;
+
+public interface ICommand
+{
+    Guid CorrelationId { get; set; }
+    Guid TransactionId { get; set; }
+}

Core/CommandQueries/ProblemDetails.cs

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+namespace SWP.Core.CommandQueries;
+
+/// <summary>
+/// Represents a standardized error response according to RFC 9457 (Problem Details for HTTP APIs).
+/// This class provides a consistent way to communicate errors in HTTP APIs, including details about the error type,
+/// status code, and additional context. It also supports extensions for custom error information.
+/// 
+/// RFC 9457 Documentation: https://www.rfc-editor.org/rfc/rfc9457.html
+/// </summary>
+public class ProblemDetails
+{
+    /// <summary>
+    /// A URI reference that identifies the problem type. This is typically a link to human-readable documentation about the error.
+    /// </summary>
+    public string Type { get; set; }
+
+    /// <summary>
+    /// A short, human-readable summary of the problem. It should not change between occurrences of the same error.
+    /// </summary>
+    public string Title { get; set; }
+
+    /// <summary>
+    /// The HTTP status code generated by the server for this occurrence of the problem. This allows the client to understand the general category of the error.
+    /// </summary>
+    public int? Status { get; set; }
+
+    /// <summary>
+    /// A human-readable explanation specific to this occurrence of the problem. It provides additional details about the error.
+    /// </summary>
+    public string Detail { get; set; }
+
+    /// <summary>
+    /// A URI reference that identifies the specific occurrence of the problem. This can be used to trace the error in logs or debugging tools.
+    /// </summary>
+    public string Instance { get; set; }
+
+    /// <summary>
+    /// A dictionary for additional, custom error information. This allows extending the problem details with application-specific fields.
+    /// </summary>
+    [Newtonsoft.Json.JsonExtensionData]
+    public Dictionary<string, object> Extensions { get; } = new();
+
+    /// <summary>
+    /// Adds a custom extension to the problem details.
+    /// </summary>
+    /// <param name="key">The key for the extension.</param>
+    /// <param name="value">The value of the extension.</param>
+    public void AddExtension(string key, object value) => Extensions.Add(key, value);
+
+
+    /// <summary>
+    /// Removes a custom extension from the problem details.
+    /// </summary>
+    /// <param name="key">The key of the extension to remove.</param>
+    public void RemoveExtension(string key) => Extensions.Remove(key);
+}