longbridge-northbound-flow Stock Connect cross-border capital flow analysis. Identifies northbound (foreign → A-share) and southbound (mainland → HK) net flows, sector biases, and AH-premium arbitrage signals. Response language : match the user's input language — Simplified Chinese / Traditional Chinese / English. When to use - "今天北向资金净买入多少" , "northbound net inflow today" , "今天北向資金淨買入多少" - "外资在加仓哪些板块" , "which sectors are foreigners buying" - "南向资金今日动向" , "southbound flow today" - "陆港通套利机会" , "AH premium arbitrage signal" - "北向连续净流入天数" , "consecutive northbound inflow days" For single-stock…