feat(webapp): admin can delete users from /admin

[isshaddad]

CI typecheck is expected to fail until the cloud PR ships. This PR consumes BillingClient.deleteUser and DeleteUserResponse, both of which are added in the pair PR's release of @trigger.dev/platform@1.0.28. The webapp is currently pinned to 1.0.27 (the latest published version), which doesn't yet have those exports.

Summary

• Adds a Delete button to the admin users table at /admin, with a
  type-to-confirm modal and a server-side guard against self-delete.
  The action proxies to the platform service, which performs the
  deletion server-side.
• Schema migration: PersonalAccessToken.userId and MfaBackupCode.userId
  switch from default Restrict to onDelete: Cascade so user deletion
  succeeds at the FK level. All other User relations were already correct.
• New UserDeletionAuditLog table records each admin deletion
  (denormalized, no FKs to User so the row survives).

Test plan

• Migration applies cleanly (pnpm run db:migrate)
• /admin shows Delete next to Impersonate; the button does not
  appear on the signed-in admin's own row
• Confirm modal requires typing delete <email> exactly to enable
• POST /admin with intent=delete + your own user id returns 400
• Successful delete redirects to /admin?deleted=1 with a success
  banner; an audit row is written to UserDeletionAuditLog
• Re-deleting an already-gone user returns the success banner
  (idempotent)

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Latest commit: 8a11f9e

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Walkthrough

Adds an admin user-deletion flow: documentation for a server-side delete endpoint; a new DeleteUserDialog React component requiring the exact delete {email} confirmation and posting intent=delete; admin index loader/action updated to handle intent=delete (authorization, self-delete prevention, client IP extraction, call to platform deletion service, redirect on success, typed JSON errors) while preserving impersonation under intent=impersonate; new platform deleteUser service wrapper; Prisma migration and UserDeletionAuditLog model; MfaBackupCode/PersonalAccessToken relations set to cascade; and a change to PAT auth to best-effort lastAccessedAt updates with error handling.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Additional context

1. Admin route: schema-validated form intents (delete and impersonate), typed JSON error responses for failures/unknown intents, redirects on successful delete via /admin?deleted=1.
2. UI: modal form includes hidden intent=delete and id, disables submit until typed confirmation matches delete {email}, closes on navigation/submission.
3. Platform service: deleteUser(userId, { adminUserId, adminEmail, reason?, ipAddress? }) added; errors are logged/thrown.
4. Database: migration adds UserDeletionAuditLog table, indexes, and adjusts FK constraints; Prisma schema adds UserDeletionAuditLog model and sets onDelete/onUpdate: Cascade for MfaBackupCode.user and PersonalAccessToken.user.
5. Auth: authenticatePersonalAccessToken uses updateMany to touch lastAccessedAt, logs and treats a zero-count update as a miss.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main feature: enabling admin users to delete users from the /admin interface.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description provides comprehensive context, test plan, and implementation details despite noting CI typecheck will fail until a paired cloud PR ships.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/admin-account-deletion

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