feat: stock confidence badges, multi-vendor price comparison, expanded Cisco TMG + Juniper HCT
Stock API & Dashboard:
- /api/stock/summary: vendor_breakdown adds avg_confidence, currencies, conf_per_warehouse/aggregated/boolean
- /api/stock/summary: new price_comparison endpoint (multi-vendor SKUs, min/max/avg price)
- /api/stock/summary: totals adds multi_vendor_skus count
- Dashboard: 6th stat card (Multi-Vendor SKUs), confidence badge column (🟢 L3 / 🟡 L2 / ⚪ L1)
- Dashboard: price comparison table with vendor-by-vendor price breakdown
- Dashboard: subtitle updated to include QSFPTEK + NADDOD
- Dashboard: top sellers link to product URLs
Cisco TMG improvements:
- Added 5 new platform families: 8000 Series, NCS5500, NCS540, NCS560, NCS1000
- Per-device query strategy: iterates all switch model IDs from family filter
instead of getting only 1 switch per family → 58 switches per N9300 run
- Graceful error handling per device with rate limiting (1s between requests)
Juniper HCT: ran manually → 475 Juniper-brand transceivers seeded
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