PR #10564 — rename raw API tables to PascalCase (BOLT-917 review fix)

Sergey review on PR #10564: snake_case table names + @@map directives are wrong for the OEM adapter (convention is PascalCase with no @@map; only legacy nisc_meters uses snake_case). Renamed raw_api_sessions/raw_api_calls/raw_api_config → RawApiSession/RawApiCall/RawApiConfig in schema + migration SQL + inline doc comments. Local tests/lint/typecheck green; CI green on commit ec5cd4d.