[hogan-yuan]

Cut v0.15.0. Bumps 0.14.0 → 0.15.0 (minor: new tools and output changes for Longbridge US accounts, listed below).

Included since v0.14.0

• Longbridge US accounts (feat(tools): route US accounts' asset tools to US endpoints #173), built on longbridge SDK 5.3.0:
  • account_balance, stock_positions, cash_flow, exchange_rate, today_orders, history_orders and order_detail call the US asset and order APIs for US accounts and return the same shape as for AP accounts.
  • today_executions / history_executions work on US accounts; side is filled from the account's orders.
  • AP-only tools (fund_positions, margin_ratio, ...) are hidden for US accounts, and a direct call returns an error whose hint names the alternative.
• fx_rate (feat(tools): add fx_rate backed by ECB reference rates via Frankfurter #175): public ECB reference exchange rates via Frankfurter (latest, a past date, or a daily series), separate from Longbridge's account-conversion rates in exchange_rate.

Behaviour changes for API clients

• On US accounts, the tools above now return the AP shape instead of the raw US payloads; US-only fields stay alongside the AP keys.
• cash_flow on US accounts returns a signed balance plus direction.
• today_orders on US accounts covers the overnight session (from 20:00 ET the previous day); history_orders / history_executions read date-only bounds in New York time for US accounts.

Only Cargo.toml, Cargo.lock and server.json change.

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