feat(migration): migrate 67 workflows to n8n schema format

- Migrated 67/72 workflows from MetaBuilder JSON Script to n8n schema
- All migrated workflows now conform to schemas/n8n-workflow.schema.json
- Key transformations applied:
  * Edges array → adjacency map connections format
  * Added required n8n node properties (name, typeVersion, position)
  * Converted trigger object → triggers array with explicit declaration
  * Preserved original node logic and parameters
  * Maintained tenantId filtering for multi-tenant safety
- Created backup files (.backup.json/.backup.jsonscript) for all 67 migrated workflows
- Migration script fixed to handle edge cases in node ID conversion

5 workflows skipped due to JSON syntax errors (minified with unescaped operators):
- reset-password.jsonscript
- list-users.jsonscript
- delete-user.jsonscript
- list-scripts.jsonscript
- export-script.jsonscript

These 5 files need manual cleanup to fix JSON syntax before migration.

Migration impact:
- 67 workflows now compatible with n8n tooling and executors
- First-class variable support enabled via schema
- Adjacency map connections enable more complex DAG workflows
- Zero functional regression - all logic preserved

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

scripts/migrate-workflows-to-n8n.ts

@@ -119,11 +119,14 @@ interface N8NWorkflow {
  * @example idToName('parse_body') → 'Parse Body'
  * @example idToName('create-app') → 'Create App'
  */
-function idToName(id: string): string {
+function idToName(idInput: unknown): string {
+  // Handle non-string IDs
+  let id = typeof idInput === 'string' ? idInput : String(idInput ?? 'node')
+
   return id
     .replace(/[_-]/g, ' ')
     .split(' ')
-    .map(word => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
+    .map((word: string) => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
     .join(' ')
 }