feat(aircraft): replace TS configs with JSON, publish separately

[nabeelio]

The 36 per-aircraft TypeScript classes become JSON feature documents, and they stop travelling inside the scripts zip. Pairs with nabeelio/acars#240 and phpvms/acars-plugin#19.

• Coverage was verified 1:1 before deleting anything: every class had a JSON equivalent and every JSON had a class, no orphans either way. src/interface/aircraft.ts goes with them since only those files imported it. defs.ts and types/ stay, because src/rules/ imports them independently.
• buildAircraftConfigsTask bundles the documents into artifacts/aircraft.json, kept outside dist/ so buildZipTask doesn't sweep it into the zip.
• distribute.yml publishes that to configs/aircraft-<version>.json plus a -latest alias. Version is the tag without the v, or the last five of the sha. The client fetches it from the acars.aircraft_config_url Replane key, so the aircraft library updates without rebuilding or redownloading everything else.
• The bundle is a flat map of filename to contents, i.e. the directory serialized. The client writes each entry straight back out, so neither side needs a schema, and _default_flaps rides along despite being a bare array rather than a config document.
• README's aircraft section is rewritten for the JSON format. The old one documented the AircraftConfig class that no longer exists.
• Includes the earlier unpushed ci(release): publish under scripts/v8/ commit, since the workflow change here builds directly on it.

npm run build from clean produces the bundle with all 36 documents, and dist/ carries no aircraft JSON.