chore: release v5.2.1

[hogan-yuan]

Release v5.2.1. Bumps workspace 5.2.0 → 5.2.1.

New since v5.2.0

• Added: OrderStatus::DelayedNotReported — monitoring, the state a time-condition order sits in before it is reported to the exchange; appended after PartialWithdrawal so C/C++/Node.js discriminants stay stable (feat(trade): add DelayedNotReported order status and time-condition orders #595)
• Added: time-condition orders — delayed_until on submit / multi-leg submit (held in DelayedNotReported and sent at that time, ≤ 90 days ahead; multi-leg LO / MO only) and on replace (move the time, or clear_delayed_until to turn it back into a regular order); Order / OrderDetail gain delayed_until. Across Rust, C, C++, Java, Node.js and Python (the Go SDK ships separately, openapi-go#123) (feat(trade): add DelayedNotReported order status and time-condition orders #595)
• Added: QuoteTransport config option to serve quote pull APIs over HTTP, exposed in every binding layer (feat(quote): add QuoteTransport to serve quote pull APIs over HTTP #604)

Only Cargo.toml (workspace version + internal dep reqs) and CHANGELOG.md change.

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