raposza/tools: apps/sandbox/src/main/resources/fixtures/aviation/daml/Main.daml

Daml contract source - raposza/tools/apps/sandbox/src/main/resources/fixtures/aviation/daml/Main.daml ```daml -- Copyright (c) 2026 bentzn -- SPDX-License-Identifier: Apache-2.0 -- -- THE AVIATION MAINTENANCE REFERENCE FIXTURE - core model. -- -- Authority: `private/documents/fixture_aviation.md`. T