feat(jobs): wire auto-triggering on bom_changed events, add module guard

- Add IsEnabled("jobs") guard to triggerJobs() to skip when module disabled
- Fire bom_changed trigger from HandleAddBOMEntry, HandleUpdateBOMEntry,
  HandleDeleteBOMEntry (matching existing HandleMergeBOM pattern)
- Add 4 integration tests: revision trigger, BOM trigger, filter mismatch,
  module disabled
- Fix AppShell overflow: hidden -> auto so Settings page scrolls
- Clean old frontend assets in deploy script before extracting

Closes #107

scripts/deploy.sh

@@ -77,6 +77,9 @@ if systemctl is-active --quiet silod 2>/dev/null; then
     sudo systemctl stop silod
 fi
 
+# Clean old frontend assets before extracting
+sudo rm -rf "$DEPLOY_DIR/web/dist/assets"
+
 # Extract
 echo "  Extracting..."
 sudo tar -xzf /tmp/silo-deploy.tar.gz -C "$DEPLOY_DIR"