[Advanced Orders] Expand execution conditions for trigger price and time windows

[floxxih]

The advanced order model needs richer trigger logic so users can express realistic strategies beyond the current minimal condition set.

Acceptance criteria:

• Support explicit trigger price thresholds.
• Support execution windows or validity ranges.
• Preserve partial-fill permissions where applicable.

[Just-Bamford]

@Just-Bamford has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi there, I'd love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Just-Bamford to this issue.

[TYDev01]

@TYDev01 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello Chief, I would like to resolve this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @TYDev01 to this issue.

[drips-wave]

Congratulations, @TYDev01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @TYDev01: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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