fix(sdmx_datasets_ecb): strip stale sdmx key from meta.json (post-#82 manifest contract)

reshape sdmx_datasets_ecb: entry metadata -> dimensions list

Prune sdmx_datasets_ecb: drop description index left by the rebuild

Rebuild sdmx_datasets_ecb: title-only search surface, ECB title repair, hybrid titles for every agency

strip legacy sdmx meta block (1-250 of 7930)

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool