fix: auto-apply DB schema on fresh install and fix admin registration (#81)

- Auto-apply schema.sql when database tables don't exist (embedded in binary)
- Handle missing tables gracefully during admin registration (treat as fresh install)
- Fix docker-compose depends_on to wait for postgres healthcheck
- Rename personal folder from 'Mi Carpeta' to 'My Folder' with backward compat
- Translate remaining Spanish messages to English

docker-compose.yml

@@ -31,7 +31,8 @@ services:
     networks:
       - oxicloud
     depends_on:
-      - postgres
+      postgres:
+        condition: service_healthy
     environment:
       - "OXICLOUD_DB_CONNECTION_STRING=postgres://postgres:postgres@postgres/oxicloud"
       - "DATABASE_URL=postgres://postgres:postgres@postgres/oxicloud"