Implement build system for Cursor Pro with platform-specific packaging

- Added build.py script to automate the packaging process for macOS and Windows.
- Created CursorKeepAlive.mac.spec and CursorKeepAlive.win.spec for application specifications.
- Updated .gitignore to exclude build artifacts and IDE files.
- Enhanced directory structure for output files and included configuration file handling in the build process.

.gitignore

@@ -1,6 +1,23 @@
-.idea
-__pycache__
+# PyInstaller
+build/
+dist/
+*.spec
+!CursorKeepAlive.mac.spec
+!CursorKeepAlive.win.spec
 
-build
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
 
-venv
+# Logs
+*.log
+
+# IDE
+.vscode/
+.idea/
+
+# Mac
+.DS_Store
+
+venv/