Add detailed logging to workflow creation endpoint

This will help diagnose the 'Cannot read properties of undefined' error
by logging each step of the workflow creation process.

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

server.js

@@ -692,14 +692,23 @@ app.post('/api/workflows', authenticateSSO, async (req, res) => {
     const { name, description, definition } = req.body;
     const id = generateUUID();
 
+    console.log('[Workflow] Creating workflow:', name);
+    console.log('[Workflow] Definition:', JSON.stringify(definition, null, 2));
+
     await pool.query(
       'INSERT INTO workflows (id, name, description, definition, created_by) VALUES (?, ?, ?, ?, ?)',
       [id, name, description, JSON.stringify(definition), req.user.username]
     );
 
+    console.log('[Workflow] Successfully inserted workflow:', id);
+
     res.json({ id, name, description, definition });
+
+    console.log('[Workflow] Broadcasting workflow_created');
     broadcast({ type: 'workflow_created', workflow_id: id });
+    console.log('[Workflow] Broadcast complete');
   } catch (error) {
+    console.error('[Workflow] Error creating workflow:', error);
     res.status(500).json({ error: error.message });
   }
 });