IAV-1208/fix: harden workflow credential pipeline — WhatsApp trigger, fake credential generation, injection safety
This MR fixes a series of interconnected bugs in the workflow creation and credential injection pipeline that caused workflow deployments to fail silently or be rejected by n8n. The issues affected agents using WhatsApp, Freshdesk (with IAVIA ticketing), and any integration where a fake credential was required.
Closes IAV-1208