fix: licensing table creation, consistent meta keys, checkout virtual detection

1. License table auto-creation:
   - Added ensure_tables() check on plugins_loaded
   - Tables created automatically if missing

2. Consistent licensing meta keys:
   - ProductsController now uses _woonoow_licensing_enabled
   - Matches LicensingModule and LicenseManager

3. Checkout virtual-only detection:
   - Added needs_shipping to Cart interface
   - Checkout uses cart.needs_shipping from WooCommerce API
   - Fallback to item-level virtual/downloadable check

4. Login redirect for logged-in users added previously

customer-spa/src/lib/cart/store.ts

@@ -20,6 +20,7 @@ export interface Cart {
   tax: number;
   shipping: number;
   total: number;
+  needs_shipping?: boolean;
   coupon?: {
     code: string;
     discount: number;