The regex `configPath.replace(/\/[^/]+$/, "")` only matches forward
slashes, so on Windows (which uses backslashes) it returns the full
path unchanged. `mkdirSync` then creates `digitalocean.json` as a
directory, causing EISDIR on the next write.
Replace with `dirname()` from `node:path` which handles both separators.
Affects digitalocean.ts, hetzner.ts, and aws.ts (oauth.ts already used
dirname correctly).
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: PR Reviewer <pr-reviewer@spawn>
Co-authored-by: L <6723574+louisgv@users.noreply.github.com>
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