longbridge-etf-analysis Prompt-only analysis skill. Analyses ETFs across five dimensions: product profile, tracking error, liquidity, premium/discount, and allocation fit — supporting both US-listed ETFs and A-share ETFs. Response language : match the user's input language — Simplified Chinese / Traditional Chinese / English. When to use - "QQQ 和 QQQM 哪个更适合长期持有？" / "QQQ vs QQQM for long-term holding?" - "这只 ETF 的跟踪误差大不大？" / "Is the tracking error on this ETF high?" - "510300 现在溢价还是折价？" / "Is 510300 trading at a premium or discount?" - "帮我分析沪深300 ETF 的流动性" / "Analyse the liquidity of CSI 300 E…