Move all TablesDB* test files from tests/e2e/Services/Databases/ to a
new tests/e2e/Services/TablesDB/ directory, updating namespaces and
adding explicit imports for shared base traits. Add TablesDB as a
separate service in the CI matrix so /v1/databases and /v1/tables tests
run as independent parallel jobs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>