Add DATA-LICENSES.md, the data-import scripts and their compose service

DATA-LICENSES.md

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+# Data licenses
+
+Every shipped dataset, its source, its licence and the attribution it asks for. A
+`data-import/` script rebuilds each sourced table; a curated one is hand-written.
+
+| Table | Source | Licence | Attribution | Rebuild |
+|-------|--------|---------|-------------|---------|
+| `misc/country.tsv` | [datasets/country-codes](https://github.com/datasets/country-codes) | [PDDL 1.0](https://opendatacommons.org/licenses/pddl/1-0/) | none required | `data-import/country.py` |
+| `misc/currency.tsv` | [datasets/currency-codes](https://github.com/datasets/currency-codes); symbols from [Unicode CLDR](https://github.com/unicode-org/cldr) `en.xml` and `root.xml` | PDDL 1.0; [Unicode License v3](https://www.unicode.org/license.txt) | CLDR: "Copyright © 1991-2025 Unicode, Inc. Unicode and the Unicode Logo are registered trademarks of Unicode, Inc. in the United States and other countries." | `data-import/currency.py` |
+| `misc/httpstatus.tsv` | curated (IANA HTTP status codes are facts) | — | — | — |
+| `misc/language.tsv` | curated (ISO 639-1 codes are facts) | — | — | — |
+| `misc/mimetype.tsv` | curated (IANA media types are facts) | — | — | — |
+
+Every other category is hand-written JSON under [`data/`](data), MIT like the code.
+
+```sh
+docker compose run --rm --user "$(id -u):$(id -g)" data-import data-import/country.py
+```