longbridge: add page (#22593)

pages/common/longbridge.md

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+# longbridge
+
+> AI-native tool for Longbridge Securities - real-time market data, portfolio management, and trading.
+> More information: <https://open.longbridge.com/docs/cli>.
+
+- Display a real-time quote for a stock (US, HK, A-share, or Singapore):
+
+`longbridge quote {{NVDA.US}}`
+
+- Show a candlestick (K-line) chart for a symbol:
+
+`longbridge kline {{700.HK}}`
+
+- List current portfolio positions:
+
+`longbridge positions`
+
+- Show portfolio P&L summary:
+
+`longbridge portfolio`
+
+- Fetch the latest news for a symbol:
+
+`longbridge news {{AAPL.US}}`
+
+- View financial statements for a company:
+
+`longbridge financial-report {{600519.SH}}`
+
+- Log in to a Longbridge account:
+
+`longbridge auth login`