feat: push variants button on mapped products — convert simple→variable in WC

When a mapped product is simple on WC but has variants in Odoo, a purple
"N variants" button appears in the Variants column. Clicking it:
1. Converts the WC product from simple to variable
2. Creates WC attributes and terms from Odoo attribute lines
3. Creates a WC variation for each Odoo variant with price/SKU/stock/tax/image
4. Creates woo.product.map records for each variation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-woo-odoo/fusion_woocommerce/controllers/product_search.py

@@ -232,6 +232,15 @@ class WooProductSearchController(http.Controller):
                     'sync_inventory': m.sync_inventory,
                     'instance_id': m.instance_id.id if m.instance_id else False,
                     'instance_name': m.instance_id.name if m.instance_id else '',
+                    'is_variation': m.is_variation,
+                    'odoo_variant_count': len(m.product_id.product_tmpl_id.product_variant_ids) if m.product_id else 0,
+                    'wc_is_simple': (m.woo_product_type or 'simple') == 'simple' and not m.is_variation,
+                    'needs_variant_push': (
+                        m.product_id
+                        and not m.is_variation
+                        and (m.woo_product_type or 'simple') == 'simple'
+                        and len(m.product_id.product_tmpl_id.product_variant_ids) > 1
+                    ),
                 }
                 for m in maps
             ],