Add custom QZ Tray fork with pairing key authentication

- Custom fork of QZ Tray 2.2.x with certificate validation bypassed
- Implemented pairing key (HMAC) authentication as replacement
- Modified files: PrintSocketClient.java (certificate check disabled)
- New files: PairingAuth.java, PairingConfigDialog.java
- Excluded build artifacts (out/, lib/javafx*) from repository
- Library JARs included for dependency management

tray/.gitignore

@@ -0,0 +1,33 @@
+# Build outputs
+/out/
+*.class
+
+# Node modules
+/js/node_modules
+
+# JavaFX runtime (too large, should be downloaded)
+/lib/javafx*
+
+# IDE files
+/.idea/workspace.xml
+/.idea/misc.xml
+/.idea/uiDesigner.xml
+/.idea/compiler.xml
+.idea/
+*.iml
+.vscode/
+
+# OS files
+.DS_Store
+Thumbs.db
+windows-debug-launcher.nsi.in
+
+# Build artifacts
+/fx.zip
+/provision.json
+
+# Private keys
+/ant/private/qz.ks
+
+# Logs
+*.log