Public price-comparison and hot-topics routes previously had no filter
for the flexoptix/flexoptix-selfconfigure/flexoptix-msrp marketplaces.
Flexoptix API data is customer-confidential and must not leave the system.
Adds marketplace NOT LIKE flexoptix% filter to:
- /api/price-comparison (top-50 CTE)
- /api/price-comparison/summary (both CTEs)
- /api/price-comparison/:sku (per-vendor subquery)
- /api/hot-topics price_drops query (vendor name filter)
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