Add 0.7dev→0.7 DoenetML version migration script

[dqnykamp]

Summary

Adds a one-off maintenance script, apps/api/scripts/convert_doenetml_0.7dev_to_0.7.ts, to move a single user's content off the 0.7dev DoenetML version and onto the released 0.7 version.

• Requires the owner's username as a CLI argument.
• Uses Prisma rather than raw SQL, and resolves both the source (0.7dev) and target (0.7) versions by their displayedVersion string instead of hard-coded ids — so it can run safely against production without risking a typo in a manual UPDATE.
• Supports --dry-run (mirrors the sibling delete_empty_sessions.ts script), which reports the affected row count without writing. Run this first against prod.

Usage

# dry run first
node dist/scripts/convert_doenetml_0.7dev_to_0.7.js <username> --dry-run
# then for real
node dist/scripts/convert_doenetml_0.7dev_to_0.7.js <username>

(or npx tsx scripts/convert_doenetml_0.7dev_to_0.7.ts <username> in local dev)

Notes

• Scoped to the content table only, matching the original request. contentRevisions also carries a doenetmlVersionId; if saved revision snapshots should move too, that can be added.

🤖 Generated with Claude Code

[cqnykamp]

I can't review this until #3010 is merged or until you turn CI back to normal.