Rust is the only backend and routes the app on Android and iOS. Rewrite
the migration-era crate, script and comment wording that implied Go still
runs, and note in each crate doc that Go mentions describe the retired
backend whose observable behavior remains a compatibility contract.
Drop the gomod renovate rule, the stray em dash in crowdin.yml and the migration wording in check_rust_backend.sh. Rename the SMB fixture servers so test_*.py discovery no longer implies unit tests, and describe supported_locales.dart as hand-maintained since its generator never existed.
Replace the Go backend with the Rust workspace and route Android/iOS through
UniFFI bindings. Include the migrated extension runtime, network, providers,
media metadata, downloads and library operations, with version 5.0.0+147.
Remove Go sources, adapters, native build selection and CI dependencies.
Build Rust unconditionally and lock the iOS Rust pod using a relative path.
Retain legacy source and migration evidence in a local ignored archive.
Validation: Android Kotlin compile and 53 native tests; Swift Rust-branch
equivalence and syntax; CocoaPods install; workflow, shell, Ruby, plist and
diff checks. Reuse the preceding 100 Rust tests, fmt/Clippy and five-ABI
build checkpoint; no new APK or iOS application build for this cleanup.
Known follow-up: URL/URLSearchParams globals are missing from the Rust JS
runtime. A controlled extension replay confirms a URL-resolution regression;
this commit does not fix that runtime gap.
zarzet