Add main application structure and logging configuration

- Implement main application entry point in duck-ocr.py
- Create logging configuration in logging_config.py
- Add video streaming functionality in camera.py
- Introduce main window UI in main_window.py
- Include SVG assets for UI buttons and icons
- Update .gitignore to exclude log files
- Add placeholder .gitkeep files for empty directories

duck-ocr.py

@@ -0,0 +1,21 @@
+import logging
+import sys
+
+from PySide6.QtWidgets import QApplication
+from app.main_window import MainWindow
+from app.logging_config import setup_logging
+
+setup_logging()
+
+logger = logging.getLogger(__name__)
+
+def main() -> None:
+    logger.info("Starting application")
+    
+    app = QApplication(sys.argv)
+    main_window = MainWindow()
+    main_window.show()
+    sys.exit(app.exec())
+
+if __name__ == "__main__":
+    main()