Improve subscription UI with large tier buttons

- Replace dropdown tier selection with attractive visual buttons
- Add tier-button CSS with hover effects and selection states
- Remove 'or pay by card' divider from subscription form for cleaner UI
- Update JavaScript to handle tier button selection events
- Fix Stripe module import conflict by renaming stripe directory to stripe_config
- Add responsive grid layout for tier buttons on mobile devices

stripe_config/.venv/lib/python3.12/site-packages/stripe/api_version.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+from typing_extensions import TYPE_CHECKING
+from warnings import warn
+
+warn(
+    """
+    The stripe.api_version package is deprecated and will become internal in the future.
+    """,
+    DeprecationWarning,
+)
+
+if not TYPE_CHECKING:
+    from stripe._api_version import (  # noqa
+        _ApiVersion,
+    )