fix(qa): ISSUE-001 — SKU prices 404 for SKUs containing slashes

SKUs with forward slashes (e.g. 0V2071/250159/250158) caused a 404
on /api/mappings/{sku}/prices because path separators in the SKU
were interpreted as URL path segments. Changed to query parameter.

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

api/app/routers/mappings.py

@@ -146,8 +146,8 @@ async def create_batch_mapping(data: MappingBatchCreate):
         return {"success": False, "error": str(e)}
 
 
-@router.get("/api/mappings/{sku}/prices")
-async def get_mapping_prices(sku: str):
+@router.get("/api/mappings/prices")
+async def get_mapping_prices(sku: str = Query(...)):
     """Get component prices from crm_politici_pret_art for a kit SKU."""
     app_settings = await sqlite_service.get_app_settings()
     id_pol = int(app_settings.get("id_pol") or 0) or None