fix(superset): align bootstrap with clickhousedb uri

- Why:
  - Superset bootstrap used outdated ClickHouse URI format and did not fail fast on init errors.
  - docs and exported dashboard metadata diverged from runtime connection settings.
- What:
  - build ClickHouse URI from env vars and use clickhousedb:// in init script.
  - refresh dataset metadata on existing datasets and surface import errors.
  - run create_dashboard during superset-init startup and align docs/exported URI references.
  - ignore node_modules in git.
- Check:
  - python3 -m py_compile superset/init_superset.py
  - manual dashboard smoke check in UI (charts render)

docker-compose.yml

@@ -273,7 +273,9 @@ services:
         echo 'Initializing roles...' &&
         superset init &&
         echo 'Creating ClickHouse connection and datasets...' &&
-        python /app/superset_init/init_superset.py || true &&
+        python /app/superset_init/init_superset.py &&
+        echo 'Creating dashboard and charts...' &&
+        python /app/superset_init/create_dashboard.py &&
         echo 'Superset initialized successfully'
       "
     depends_on: