docs: update docs and PROJECT.md for dual score pipeline
Task 8: documentation updates for the dual market score feature.
- CHANGELOG.md: comprehensive [Unreleased] entries for all additions
(Marktpotenzial-Score, tennis courts, dim_locations, GeoNames expansion,
DuckDB spatial, SOPS secrets, methodology page updates)
- docs/data-sources-inventory.md: add tennis courts Overpass row, update
GeoNames entry (cities1000, username=padelnomics, higher score)
- transform/sqlmesh_padelnomics/CLAUDE.md: add dim_locations to conformed
dimensions table, update source integration map with new pipeline branch,
document ST_Distance_Sphere bounding-box pattern
- PROJECT.md: add dual score to In Progress, add Gemeinde pSEO + top-50
ranking page to Next Up, add data backlog items (sports_centre, NUTS-3,
opportunity map), add Decisions Log entry
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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