Add seed tests and CI workflow

[Jim8y]

Summary

• Add a focused xUnit seed test project for low-risk repository checks.
• Add a GitHub Actions workflow that runs the seed tests on pull requests and master pushes.
• Cover localization key parity and bundled raw JSON resource sanity.

Validation

• dotnet test OneGateApp.Tests/OneGateApp.Tests.csproj --configuration Release --verbosity normal
• dotnet build OneGateApp/OneGateApp.csproj -f net10.0-android -p:AndroidSdkDirectory=/opt/homebrew/share/android-commandlinetools -p:EmbedAssembliesIntoApk=true
• dotnet build OneGateApp/OneGateApp.csproj -f net10.0-ios -p:RuntimeIdentifier=iossimulator-arm64 -p:CodesignKey=- -p:CodesignProvision=
• iOS and Android simulator screenshots will be posted in a PR comment before marking ready for review.

Notes

• Scope is intentionally limited to CI and seed tests.
• No product UI, wallet, signing, or runtime behavior changes.

[Jim8y]

Simulator validation completed for this PR.

Validation run:

• Seed tests passed: dotnet test OneGateApp.Tests/OneGateApp.Tests.csproj --configuration Release --verbosity normal (7 passed, 0 failed).
• iOS build passed: dotnet build OneGateApp/OneGateApp.csproj -f net10.0-ios -p:RuntimeIdentifier=iossimulator-arm64 -p:CodesignKey=- -p:CodesignProvision= (3 existing NU1903 SQLite warnings, 0 errors).
• Android build passed: RuntimeIdentifiers=android-arm64;android-x64 dotnet build OneGateApp/OneGateApp.csproj -f net10.0-android -p:AndroidSdkDirectory=/opt/homebrew/share/android-commandlinetools -p:EmbedAssembliesIntoApk=true (9 existing NU1903 SQLite warnings, 0 errors).
• iOS Simulator: installed and launched on iPhone 17 Pro / iOS 26.5, launch returned PID 2996.
• Android Emulator: installed and launched on emulator-5554, app PID 10797, crash buffer empty.

Screenshots:

[Copilot]

Pull request overview

Adds a small xUnit “seed” test suite and a GitHub Actions workflow to run it in CI, providing low-risk validation of repository resources (localized RESX parity and bundled raw JSON sanity) without affecting app runtime behavior.

Changes:

• Added OneGateApp.Tests xUnit project targeting net10.0 with resource-focused tests.
• Added tests to validate localized RESX key parity and validate/spot-check bundled Raw JSON resources.
• Added a GitHub Actions workflow to run the seed tests on PRs and pushes to master.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
OneGateApp.Tests/TestPaths.cs	Adds repository-root discovery helper used by tests to locate app resources reliably.
OneGateApp.Tests/ResourceParityTests.cs	Validates that each localized Strings.*.resx exposes the same set of keys as the neutral Strings.resx.
OneGateApp.Tests/RawResourceTests.cs	Validates raw JSON files parse correctly and checks a few required fields / expected protocol config values.
OneGateApp.Tests/OneGateApp.Tests.csproj	Introduces the seed test project and required test dependencies (xUnit, test SDK, coverlet collector).
.github/workflows/dotnet-tests.yml	Adds CI workflow to execute the seed tests on PRs and pushes to master.

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