Remove invalid pyqt6-qt6-multimedia dependency and add build.sh script for easy compilation

build.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Clean previous builds
+rm -rf dist build
+
+# Install requirements
+pip install -r requirements.txt
+pip install pyinstaller
+
+# Build
+pyinstaller gotify-tray.spec
+
+echo "Build complete. Executable in dist/gotify-tray/"