feat(workflows): implement workflow duplication feature

- Added functionality to duplicate workflows via a new API endpoint, allowing users to create copies of existing workflows with modified names and owners.
- Introduced utility functions for managing workflow filenames and ensuring unique names for duplicates.
- Created a user interface component for duplicating workflows, including validation for existing files and owner changes.
- Enhanced existing workflows to support the new duplication feature, ensuring seamless integration with the current workflow management system.

This update significantly improves user experience by enabling efficient workflow management and organization.

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

@@ -12,6 +12,35 @@ triggers:
     path: /new
 `;
 
+export function ensureWorkflowFilename(file) {
+  const trimmed = String(file ?? "").trim();
+  if (!trimmed) return "";
+  return /\.ya?ml$/i.test(trimmed) ? trimmed : `${trimmed}.yaml`;
+}
+
+/**
+ * Next unused copy filename: `track.yaml` → `track-copy.yaml`,
+ * `track-copy.yaml` → `track-copy-2.yaml`.
+ * @param {string} file
+ * @param {string[]} existingFiles
+ */
+export function suggestCopyFilename(file, existingFiles = []) {
+  const name = ensureWorkflowFilename(file) || "workflow.yaml";
+  const match = name.match(/^(.*?)(\.ya?ml)$/i);
+  const base = match ? match[1] : name;
+  const ext = match ? match[2] : ".yaml";
+  const existing = new Set(existingFiles);
+
+  const copyMatch = base.match(/^(.*)-copy(?:-(\d+))?$/);
+  const root = copyMatch ? copyMatch[1] : base;
+  const candidate = (i) =>
+    i <= 1 ? `${root}-copy${ext}` : `${root}-copy-${i}${ext}`;
+
+  let n = copyMatch ? Number(copyMatch[2] || 1) + 1 : 1;
+  while (existing.has(candidate(n))) n += 1;
+  return candidate(n);
+}
+
 let uidSeq = 0;
 
 export function nextUiId(prefix = "ui") {