Add ExtractSwissQrCode feature and update feature order

Updated PHASENPLAN.md and ROADMAP.md to reflect the new
feature order, making "ExtractSwissQrCode" Feature 2 and
renumbering previous Features 2-5 to 3-6. Added detailed
steps, endpoints, and acceptance criteria for the new
feature.

Implemented `ISwissQrCodeProcessor` interface with
`DevExpressSwissQrCodeProcessor` for extracting and parsing
Swiss QR Codes using DevExpress and Codecrete libraries.
Registered the new service in DependencyInjection.cs.

Introduced `SwissQrCodeData` value object and
`SwissQrCodeNotFoundException` for domain modeling and
error handling. Updated project dependencies to include
libraries for QR code processing.

Adjusted existing feature descriptions and steps to align
with the new feature order.

DocumentOperator.Domain/Exceptions/SwissQrCodeNotFoundException.cs

@@ -0,0 +1,22 @@
+namespace DocumentOperator.Domain.Exceptions;
+
+/// <summary>
+/// Exception thrown when a Swiss QR Code cannot be found in a PDF document.
+/// </summary>
+public sealed class SwissQrCodeNotFoundException : Exception
+{
+    public SwissQrCodeNotFoundException()
+        : base("No Swiss QR Code found on the last page of the PDF document.")
+    {
+    }
+
+    public SwissQrCodeNotFoundException(string message)
+        : base(message)
+    {
+    }
+
+    public SwissQrCodeNotFoundException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+}

DocumentOperator.Domain/ValueObjects/SwissQrCodeData.cs

@@ -0,0 +1,129 @@
+namespace DocumentOperator.Domain.ValueObjects;
+
+/// <summary>
+/// Represents Swiss QR Code data according to Swiss QR Bill Standard 2.0.
+/// Immutable value object containing all fields from a Swiss QR payment part.
+/// </summary>
+public sealed record SwissQrCodeData
+{
+    /// <summary>
+    /// QR type - always "SPC" for Swiss Payment Code
+    /// </summary>
+    public required string QrType { get; init; }
+
+    /// <summary>
+    /// Version of the Swiss QR Code standard (e.g., "0200" for version 2.0)
+    /// </summary>
+    public required string Version { get; init; }
+
+    /// <summary>
+    /// Character set code (always "1" for UTF-8)
+    /// </summary>
+    public required string CodingType { get; init; }
+
+    /// <summary>
+    /// IBAN of the creditor (payee)
+    /// </summary>
+    public required string Iban { get; init; }
+
+    /// <summary>
+    /// Creditor (payee) information
+    /// </summary>
+    public required AddressData Creditor { get; init; }
+
+    /// <summary>
+    /// Ultimate creditor information (optional)
+    /// </summary>
+    public AddressData? UltimateCreditor { get; init; }
+
+    /// <summary>
+    /// Payment amount (null if not specified)
+    /// </summary>
+    public decimal? Amount { get; init; }
+
+    /// <summary>
+    /// Currency code (CHF or EUR)
+    /// </summary>
+    public required string Currency { get; init; }
+
+    /// <summary>
+    /// Ultimate debtor (payer) information (optional)
+    /// </summary>
+    public AddressData? UltimateDebtor { get; init; }
+
+    /// <summary>
+    /// Reference type (QRR, SCOR, or NON)
+    /// </summary>
+    public required string ReferenceType { get; init; }
+
+    /// <summary>
+    /// Payment reference (format depends on ReferenceType)
+    /// </summary>
+    public string? Reference { get; init; }
+
+    /// <summary>
+    /// Unstructured message (max 140 characters)
+    /// </summary>
+    public string? UnstructuredMessage { get; init; }
+
+    /// <summary>
+    /// Bill information (structured data for automated processing)
+    /// </summary>
+    public string? BillInformation { get; init; }
+
+    /// <summary>
+    /// Alternative procedure parameters (up to 2 entries)
+    /// </summary>
+    public IReadOnlyList<string>? AlternativeProcedureParameters { get; init; }
+}
+
+/// <summary>
+/// Represents address data in Swiss QR Code (creditor or debtor)
+/// </summary>
+public sealed record AddressData
+{
+    /// <summary>
+    /// Address type: "S" for structured, "K" for combined
+    /// </summary>
+    public required string AddressType { get; init; }
+
+    /// <summary>
+    /// Name of person or company
+    /// </summary>
+    public required string Name { get; init; }
+
+    /// <summary>
+    /// Street name (structured address only)
+    /// </summary>
+    public string? Street { get; init; }
+
+    /// <summary>
+    /// Building number (structured address only)
+    /// </summary>
+    public string? BuildingNumber { get; init; }
+
+    /// <summary>
+    /// Address line 1 (combined address only)
+    /// </summary>
+    public string? AddressLine1 { get; init; }
+
+    /// <summary>
+    /// Address line 2 (combined address only)
+    /// </summary>
+    public string? AddressLine2 { get; init; }
+
+    /// <summary>
+    /// Postal code
+    /// </summary>
+    public required string PostalCode { get; init; }
+
+    /// <summary>
+    /// City/town name
+    /// </summary>
+    public required string City { get; init; }
+
+    /// <summary>
+    /// Two-letter country code (ISO 3166-1 alpha-2)
+    /// </summary>
+    public required string Country { get; init; }
+}