Handle 402 Payment Required from Evotor API gracefully

Return empty list for groups/products when Evotor returns 402,
instead of crashing the refresh with an unhandled HTTP error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/evotor_api.py

@@ -33,6 +33,8 @@ async def fetch_groups(access_token: str, store_id: str) -> list[dict]:
             headers={"Authorization": f"Bearer {access_token}"},
             timeout=15,
         )
+        if resp.status_code == 402:
+            return []
         resp.raise_for_status()
         data = resp.json()
         items = data.get("items", data) if isinstance(data, dict) else data
@@ -46,6 +48,8 @@ async def fetch_products(access_token: str, store_id: str) -> list[dict]:
             headers={"Authorization": f"Bearer {access_token}"},
             timeout=15,
         )
+        if resp.status_code == 402:
+            return []
         resp.raise_for_status()
         data = resp.json()
         items = data.get("items", data) if isinstance(data, dict) else data