feat(translation): ITranslationService for plugins (backendconfiguration#1384)

[renemadsen]

Summary

Adds Microting.eFormApi.BasePn.Abstractions.Translation.ITranslationService so plugins can machine-translate server-side through the API host (needed by microting/eform-backendconfiguration-plugin#1384, v2 of #1324).

public interface ITranslationService
{
    bool IsConfigured { get; }
    Task<OperationDataResult<string>> TranslateText(string sourceText, string sourceLanguageCode, string targetLanguageCode);
}

• Only the interface moves. The host (eform-angular-frontend) keeps the Google implementation, the options and the API key, and registers the implementation in DI. Plugins resolve it optionally, so the key never reaches them.
• The interface has its own namespace. The host still declares an ITranslationService of its own until its follow-up PR switches over, and its Startup imports Microting.eFormApi.BasePn.Abstractions. With a separate namespace, a plain dependabot bump to this version cannot cause an ambiguous reference.

Release order

1. Merge this PR, then tag v10.0.37 on master. The tag workflow publishes the NuGet package.
2. eform-angular-frontend draft PR: bumps BasePn to 10.0.37 and implements this interface.
3. eform-backendconfiguration-plugin draft PR: uses it in CreateTask/UpdateTask.

Tests

This repo has no test project. The interface is exercised by the host's unit tests and the plugin's integration tests (fake translator) in the follow-up PRs.

Not verified

Builds locally (dotnet build, and dotnet pack to a scratch feed that both follow-ups were built against). No runtime check.

Refs microting/eform-backendconfiguration-plugin#1384

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused interface addition is consistent with the planned host and plugin integrations and has no identified defects.

Review effort: Balanced
Findings: None

What changed in this PR

Adds a shared translation-service contract so plugins can request host-managed server-side translations without receiving API credentials.

Changes:

• Adds ITranslationService with configuration status and asynchronous translation.
• Isolates the contract in a dedicated namespace to avoid host naming conflicts.

File	Description
eFormApi.BasePn/​Abstractions/​Translation/​ITranslationService.cs	Defines the plugin-facing translation contract and behavior.

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