Aggregates by autonomous community (CCAA)

Return per-CCAA totals from the offline projection. The ETag is bound to the shared asv1 stats generation and uses 60-second must-revalidate caching. Award-procedure counts come only from the corporate PLACSP v3 summary; the deprecated contracts_count is an explicitly labelled alias and contracts_total_eur is always withheld. Also available without .json suffix. Returns 503 rather than rebuilding aggregates in PHP-FPM.