Update chat events/transcription flow and container startup fixes

Frontend/scripts/compose-worker.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+# Worker container starts from clean image.
+# Install deps without frontend postinstall hooks (nuxt prepare) to keep worker lean/stable.
+npm install --ignore-scripts
+ARCH="$(uname -m)"
+if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then
+  npm rebuild sharp --platform=linux --arch=arm64v8 \
+    || npm rebuild sharp --platform=linux --arch=arm64 \
+    || npm install sharp --platform=linux --arch=arm64v8 --save-exact=false \
+    || npm install sharp --platform=linux --arch=arm64 --save-exact=false
+elif [ "$ARCH" = "x86_64" ] || [ "$ARCH" = "amd64" ]; then
+  npm rebuild sharp --platform=linux --arch=x64 \
+    || npm install sharp --platform=linux --arch=x64 --save-exact=false
+else
+  npm rebuild sharp || true
+fi
+npx prisma generate
+
+# Ensure DB is reachable before the worker starts consuming jobs.
+until node -e "const u=new URL(process.env.DATABASE_URL||''); const net=require('net'); const s=net.createConnection({host:u.hostname,port:Number(u.port||5432)}); s.on('connect',()=>{s.end(); process.exit(0);}); s.on('error',()=>process.exit(1)); setTimeout(()=>process.exit(1), 1000);" ; do
+  echo "Waiting for PostgreSQL..."
+  sleep 1
+done
+
+exec npm run worker:delivery