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.
Coordinated rename of the nine store-named bridge surfaces: Go
exports (InitExtensionStoreJSON -> InitExtensionRepoJSON etc.),
method-channel strings, the Kotlin and Swift handlers, and the Dart
PlatformBridge methods. Channel strings verified 1:1 across
Dart/Kotlin/Swift; gomobile bindings match the new export names.
Android MediaStore APIs untouched. store_registry_url pref key kept
for existing users. Local Android/iOS builds need the gobackend
AAR/xcframework rebuilt; CI does this in the release workflow.
store_provider.dart -> repo_provider.dart, screens/store/ ->
screens/repo/; Store* classes and storeProvider renamed to Repo*.
Method-channel names in platform_bridge stay unchanged (bridge ABI
matching the Kotlin handler).
zarzet