feat(web-client-tpos): Phase C-E — shop settings, top products report, enhanced placeholders
BFF Endpoints (3 new):
- GET/PUT shops/{id}/settings — shop features config, hours, days
- GET reports/top-products — bestselling products by quantity + revenue
PosDataService (3 new methods):
- GetShopSettings, UpdateShopSettings, GetTopProducts
ShopPage UI (149 lines):
- Settings tab: opening hours, business days, features config form
- Reports tab: top products table alongside revenue report
- Enhanced default placeholder for sections without DB tables
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