fix(api): enrol the dev session user in the workspace

[phanlemanh]

bun run dev:session me@example.com mints a session that the app then rejects with
"You are not a member of this workspace." — the connections page 500s on it, and so
does anything else workspace-scoped.

The script writes the session row straight through Prisma, so better-auth's
session.create.before hook never runs, and that hook is what calls
ensureWorkspaceMembership. A brand-new dev user therefore never gets a member row.
It only looks like it works on a workspace that still has zero members, where the
backfill branch enrols everyone who already exists.

Two lines: call the same helper the hook calls, and carry activeOrganizationId the
same way it does.

---

Summary by cubic

Fixes dev sessions so bun run dev:session mints sessions the app accepts. The script wrote session rows directly through Prisma, skipping the session.create.before hook that calls ensureWorkspaceMembership, so new dev users were never enrolled in a workspace and workspace-scoped calls rejected them with "You are not a member of this workspace." The script now calls the same helper and sets activeOrganizationId the same way the hook does.

^{Written for commit 1c47c66. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}