Add non-sensitive order transition audit, endpoint, and tests

[smog123]

This PR adds a read-only, non-sensitive audit of order state transitions:

• Adds order_transitions table to persist from/to timestamps, optional tx hash, and category.
• Persists transitions on announce, src/dst lock, secret reveal, and manual status updates.
• Exposes GET /orders/:id/transitions to retrieve transition summaries.
• Removes preimage from public order serialization to avoid leaking secrets.
• Adds tests covering happy-path and refund transitions.

Tests: pnpm --filter @oversync/coordinator test passes locally.

[vercel]

@smog123 is attempting to deploy a commit to the karagoz's projects Team on Vercel.

A member of the Team first needs to authorize it.

[drips-wave]

Hey @smog123! 👋 It looks like this PR isn't linked to any issue.

If this PR is for one of the issues assigned to you as part of a Wave, please link it to ensure your contribution is tracked properly. You can do this by adding a keyword to the PR description (e.g., Closes #123), or by clicking a button below:

Issue	Title
#179	[SCF high] Add coordinator order-state transition audit log summary	Link to this issue

ℹ️ Learn more about linking PRs to issues

[karagozemin]

Thanks for the transition audit PR. I started the review from the karagozemin maintainer account, but this branch is currently not mergeable against latest master.

GitHub reports it as conflicting, and a local merge confirms a conflict in:

coordinator/src/persistence/orders-repo.ts

Please rebase or merge latest master, resolve the conflict, and link the PR body to issue #179 (Closes #179) so Wave tracking is clean. After it is mergeable I can run the coordinator tests/build and review the transition audit behavior.

[karagozemin]

Thanks for the update. I rechecked again after the latest commit, but the branch is still not mergeable against current master.

A local merge now conflicts in:

coordinator/src/persistence/orders-repo.ts
coordinator/src/services/order-service.ts

Please rebase/merge latest master again and resolve those conflicts. After GitHub reports the PR as mergeable, I can run pnpm --filter @oversync/coordinator test and pnpm --filter @oversync/coordinator build for the transition audit behavior.