fix(infra): install pgvector and uuid-ossp extensions in mosaic-db-init

Mosaic Stack API schema requires both vector (pgvector) and uuid-ossp
extensions. The mosaic user cannot CREATE EXTENSION (requires superuser),
so extensions must be installed by the admin user during db-init before
Prisma runs migrations.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.swarm.portainer.yml

@@ -91,6 +91,10 @@ services:
         psql -h openbrain_brain-db -U $${PGUSER} -tc "SELECT 1 FROM pg_database WHERE datname='$${MOSAIC_DB}'" | grep -q 1 || \
           psql -h openbrain_brain-db -U $${PGUSER} -c "CREATE DATABASE $${MOSAIC_DB} OWNER $${MOSAIC_USER} ENCODING 'UTF8' LC_COLLATE='C' LC_CTYPE='C' TEMPLATE template0;"
 
+        echo "Enabling required extensions in $${MOSAIC_DB}..."
+        psql -h openbrain_brain-db -U $${PGUSER} -d $${MOSAIC_DB} -c "CREATE EXTENSION IF NOT EXISTS vector;"
+        psql -h openbrain_brain-db -U $${PGUSER} -d $${MOSAIC_DB} -c "CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\";"
+
         echo "Mosaic database ready: $${MOSAIC_DB}"
     networks:
       - openbrain-brain-internal