fix(recorders): use already-imported uuidv4 instead of dynamic import

Dynamic `(await import('uuid')).v4()` inside the /start route handler
re-imports the module every call (though Node caches it). uuidv4 is
already imported at the top of the file.

services/mam-api/src/routes/recorders.js

@@ -285,7 +285,7 @@ router.post('/:id/start', async (req, res, next) => {
     // live-asset: create the asset row right now (status='live') so the library
     // shows the recording while it is happening. The capture container will
     // tee an HLS stream into /live/<assetId>/.
-    const assetIdLive = (await import('uuid')).v4();
+    const assetIdLive = uuidv4();
     try {
       await pool.query(
         `INSERT INTO assets (