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

.gitignore

@@ -3,10 +3,14 @@ recticel/
 .venv/
 __pycache__/
 app/__pycache__/
-tray/
 jdk-11.0.20-full/
 jdk-11.0.21+9-jre/
 jre-11-windows.zip
+
+# QZ Tray build artifacts (keep source code, ignore builds)
+tray/out/
+tray/lib/javafx*
+tray/js/node_modules
 # Ignore generated or local files
 backup/backup/