feat: Add contract support for stream escrow release conditions

[Handynfts2]

Implements conditional escrow system for StellarStream contract with:

• Condition types: Milestone, KYC, AdminWhitelist
• Oracle-based condition confirmation
• 90-day timeout enforcement with emergency release
• Sender cancellation with refund
• Complete event emissions for all escrow operations

Acceptance criteria met:

• Condition oracle address set at escrow creation
• Funds not releasable without oracle confirmation
• 90-day timeout enforced on-chain
• Admin emergency release after timeout

Closes #685

[drips-wave]

@Handynfts2 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[vercel]

@Handynfts2 is attempting to deploy a commit to the ritik4ever's projects Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 3800b886-e33a-447b-a9a3-2f0b7f208e00

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}