feat(server): implement workflow triggering and enhance script execution

- Added support for triggering workflows via a new triggerWorkflow function, allowing for fire-and-forget execution of workflows with optional data transformation using JSONata.
- Introduced a $workflows API in the script sandbox for accessing workflow triggers.
- Enhanced existing script execution functions to accommodate the new workflow triggering capabilities.
- Updated workflow-mermaid.js and WorkflowsPage to reflect the new workflow type in labels for better clarity.

packages/web/src/lib/workflow-mermaid.js

@@ -47,6 +47,7 @@ function mermaidLabel(text) {
 function triggerLabel(t) {
   const type = String(t?.type ?? "").toLowerCase();
   if (type === "cron") return `cron ${t.schedule ?? ""}`.trim();
+  if (type === "workflow") return "workflow";
   const method = t?.method ?? "POST";
   const path = t?.path ?? "";
   return `${method} ${path}`.trim();