test db: multilingual database test

one file holding several languages.

Both assumed <uid>.<lang>.ocda.db beside <uid>.<lang>.ssp, one for
one.

- test-abstraction-db.sh takes the language from the .ssp name, the
  database from the stem, and scopes every query by the doc_id that
  language resolves to: objects by doc_id, the four child tables
  through their objects, metadata by doc_id, schema.version by doc_id
  is null. It also checks what a per language loop cannot see, that the
  languages a database holds are exactly the languages there are .ssp
  files for.

- test-abstraction-db-roundtrip.sh asks for each language by name and
  holds it against its own .ssp, and requires a database of more than
  one language to refuse a round trip that names none: a reader quietly
  emitting the first language would otherwise pass against the first
  .ssp and say nothing about the other nine. Its language list comes
  from the .ssp filenames, so it still needs no sqlite3.

databases (re-)emitting all .ssp files exactly.

(assisted by Claude-Code)

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