Record a connector integration request and notify Pylon

Persists the requested connector on current_user.tenant.setting.requested_connections (idempotent, normalized by case + collapsed whitespace) and pages Pylon by creating an in-app chat issue attributed to the requester. Used by both the admin Connectors page (catalog tile + free-form) and the My Connectors page (free-form). Requires PYLON_ISSUES_API_TOKEN + PYLON_APP_ID for the Pylon side; persistence still happens when those are unset. Authenticated tenant members only; the workspace is always current_user.tenant (no tenant id in the request body).