fix: defensive qrcode version lookup in --check (#51)

Use importlib.metadata fallback when qrcode.__version__ is missing.
Closes #51

compile_all.py

@@ -541,7 +541,12 @@ def check_dependencies():
 
     try:
         import qrcode
-        print(f"  ✅ qrcode        {qrcode.__version__}")
+        try:
+            _qr_ver = qrcode.__version__
+        except AttributeError:
+            import importlib.metadata as _md
+            _qr_ver = _md.version("qrcode")
+        print(f"  ✅ qrcode        {_qr_ver}")
     except ImportError:
         print(f"  ❌ qrcode        NOT FOUND (pip install qrcode)")