feat(20-windows-client): aplikacja C# WinForms do zdalnego druku etykiet

- System tray app z NotifyIcon + ContextMenuStrip
- Polling API orderPRO (GET /api/print/jobs/pending)
- Pobieranie etykiet PDF i druk przez PdfiumViewer
- Formularz ustawień: URL API, klucz, drukarka, interwał
- Okno logów z historią (ciemny motyw, Consolas)
- Self-contained .NET 8 publish (win-x64)
- Milestone v0.7 Zdalne drukowanie etykiet — COMPLETE

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/windows/OrderPROPrint/Forms/SettingsForm.Designer.cs

@@ -0,0 +1,69 @@
+namespace OrderPROPrint.Forms;
+
+partial class SettingsForm
+{
+    private System.ComponentModel.IContainer components = null;
+    private TextBox txtApiUrl;
+    private TextBox txtApiKey;
+    private ComboBox cmbPrinter;
+    private NumericUpDown nudPollInterval;
+    private Button btnTestConnection;
+    private Button btnSave;
+    private Button btnCancel;
+    private Label lblStatus;
+
+    protected override void Dispose(bool disposing)
+    {
+        if (disposing && (components != null))
+        {
+            components.Dispose();
+        }
+        base.Dispose(disposing);
+    }
+
+    private void InitializeComponent()
+    {
+        this.Text = "OrderPRO Print — Ustawienia";
+        this.Size = new Size(450, 340);
+        this.FormBorderStyle = FormBorderStyle.FixedDialog;
+        this.MaximizeBox = false;
+        this.MinimizeBox = false;
+        this.StartPosition = FormStartPosition.CenterScreen;
+
+        var lblApiUrl = new Label { Text = "URL API:", Location = new Point(15, 20), AutoSize = true };
+        txtApiUrl = new TextBox { Location = new Point(15, 40), Size = new Size(400, 23) };
+        txtApiUrl.PlaceholderText = "https://orderpro.projectpro.pl";
+
+        var lblApiKey = new Label { Text = "Klucz API:", Location = new Point(15, 75), AutoSize = true };
+        txtApiKey = new TextBox { Location = new Point(15, 95), Size = new Size(310, 23), UseSystemPasswordChar = true };
+
+        btnTestConnection = new Button { Text = "Testuj", Location = new Point(335, 94), Size = new Size(80, 25) };
+        btnTestConnection.Click += BtnTestConnection_Click;
+
+        lblStatus = new Label { Location = new Point(15, 123), Size = new Size(400, 18), ForeColor = Color.Gray, Text = "" };
+
+        var lblPrinter = new Label { Text = "Drukarka:", Location = new Point(15, 150), AutoSize = true };
+        cmbPrinter = new ComboBox { Location = new Point(15, 170), Size = new Size(400, 23), DropDownStyle = ComboBoxStyle.DropDownList };
+
+        var lblInterval = new Label { Text = "Interwał odpytywania (sekundy):", Location = new Point(15, 205), AutoSize = true };
+        nudPollInterval = new NumericUpDown { Location = new Point(15, 225), Size = new Size(80, 23), Minimum = 5, Maximum = 300, Value = 10 };
+
+        btnSave = new Button { Text = "Zapisz", Location = new Point(230, 265), Size = new Size(90, 30) };
+        btnSave.Click += BtnSave_Click;
+
+        btnCancel = new Button { Text = "Anuluj", Location = new Point(325, 265), Size = new Size(90, 30) };
+        btnCancel.Click += BtnCancel_Click;
+
+        this.Controls.AddRange(new Control[] {
+            lblApiUrl, txtApiUrl,
+            lblApiKey, txtApiKey, btnTestConnection,
+            lblStatus,
+            lblPrinter, cmbPrinter,
+            lblInterval, nudPollInterval,
+            btnSave, btnCancel
+        });
+
+        this.AcceptButton = btnSave;
+        this.CancelButton = btnCancel;
+    }
+}