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

.gitattributes

@@ -2584,3 +2584,4 @@ sdmx_series_imf_data_fd/indexes/COUNTRY_label/components/vector/vectors.faiss fi
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 sdmx_series_estat_mar_go_am_de/indexes/rep_mar_label/components/vector/vectors.faiss filter=lfs diff=lfs merge=lfs -text
+sdmx_datasets_estat/indexes/title/components/vector/vectors.faiss filter=lfs diff=lfs merge=lfs -text

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sdmx_datasets_estat/indexes/title/meta.json

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 {
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+  "kind": "hybrid",
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 }

sdmx_datasets_estat/meta.json

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   "backend": {
@@ -20,10 +19,11 @@
     "field_links": {}
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+}