Add ECLASS names mapping for frontend

[HendrikReh]

Summary

Frontend now shows ECLASS names when available, but our BMECat sample lacks name fields, so is empty and names don’t appear. We need a code→name mapping and reindex.

Problem

• only contains without any name/descriptions.
• The extraction script produced 0 entries in , so stays null and the UI falls back to segment code.

Proposed fix

1. Source an ECLASS code→name mapping (official ECLASS export or another catalog with names) and save as in the form .
2. Reindex after the mapping exists (Created index 'products' or pipeline) so is stored in OpenSearch.
3. Optionally add a helper script/task to import from the official ECLASS CSV/XML.

Acceptance criteria

• contains code→name pairs with a non-empty count.
• Reindexed documents populate and the frontend category dropdown shows names alongside codes.