Adds parseWarehouseStock() to decode the HTML-entity-encoded warehouse_stock JSON
(us/nl/sg/cn per-region array). When the static page has warehouse data, writes:
warehouse_de_qty ← nl (EU-closest warehouse)
warehouse_global_qty ← sum(us+nl+sg+cn), or falls back to quantity_available
stock_confidence ← 3 (L3) when warehouse breakdown available, else 2
Note: per-warehouse quantities require JS execution to populate (API-loaded);
static HTML has [0,0] placeholders. The fallback ensures NADDOD global totals
appear in the competitor-by-tech dashboard comparison.
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