Add printer-config integration and Rust transformation flow docs

PrintService/Models/PrinterConfig.cs

@@ -0,0 +1,44 @@
+namespace PrintService.Models;
+
+/// <summary>
+/// Root configuration loaded from printer-config.json
+/// </summary>
+public class PrinterConfiguration
+{
+    public Dictionary<string, DocumentTypeConfig> DocumentTypes { get; set; } = new();
+}
+
+/// <summary>
+/// Configuration for a single document type (replaces DocumentConfig for printer/tray mapping)
+/// </summary>
+public class DocumentTypeConfig
+{
+    public string Name { get; set; } = string.Empty;
+    public List<PageConfig> Pages { get; set; } = new();
+
+    // Rendering settings
+    public string FontName { get; set; } = "Courier New";
+    public float FontSize { get; set; } = 10f;
+    public int HorizontalOffset { get; set; } = 0;
+    public int VerticalOffset { get; set; } = 0;
+
+    // Post-processing settings
+    public bool ArchiveAfterPrint { get; set; } = true;
+    public string? ArchivePath { get; set; }
+    public string? OutputPath { get; set; }
+    public bool SkipPostProcessing { get; set; } = false;
+
+    // Text transformation rules
+    public List<TextTransform> Transformations { get; set; } = new();
+}
+
+/// <summary>
+/// Configuration for a single page (printer and tray assignment)
+/// </summary>
+public class PageConfig
+{
+    public int PageNumber { get; set; }
+    public string PrinterName { get; set; } = string.Empty;
+    public int TrayNumber { get; set; }
+    public string? TrayLabel { get; set; }
+}