feat: add 24,963 heritage custodian records from global extraction
Major batch addition of heritage institution data:
- Japan: 12,077 institutions (libraries, museums, archives)
- Czechia: 6,760 institutions
- Switzerland: 2,390 institutions
- Belgium: 448 institutions
- Belarus: 257 institutions
- Austria: 249 institutions (with corrected GHCIDs)
- Argentina: 235 institutions (bibliotecas populares)
- Brazil: 155 institutions
- Mexico: 110 institutions
- Bulgaria: 98 institutions
- Chile: 83 institutions
- Egypt: 50 institutions
- And additional records from VN, NL, GE, KR, GB, FR, US, IN, etc.
All records include:
- Standardized GHCID identifiers (alphabetic-only abbreviations)
- GeoNames-resolved location data
- ISO 3166-2 region codes
- Provenance metadata with extraction timestamps
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