Enhance ioBroker plugin translation with DeepL API support

[Copilot]

• [x] Rebase onto master branch
• [x] Convert tests from Jest to Vitest
• [x] Update test mocking syntax (jest.mock → vi.mock)
• [x] Update assertions (jest.clearAllMocks → vi.clearAllMocks)
• [x] Update spy syntax (jest.spyOn → vi.spyOn)
• [x] Remove unused imports
• [x] Improve fallback test to verify ioBroker API call
• [x] All tests passing (20/20)
• [x] Linting passes

Summary

Successfully enhanced the fallback test to properly verify that the ioBroker translator API is called when DeepL fails.

Changes Made

Test Improvements:

• Modified the should fall back to ioBroker translator if DeepL completely fails test
• Made axios mock URL-aware by implementing a function that inspects config.url
• Mock now returns different responses based on which API is being called:
  • DeepL API (deepl.com) → rejects with error
  • ioBroker API (translator.iobroker.in) → resolves with success
• Added explicit assertion to verify ioBroker API URL was called

Before: The test just chained .mockRejectedValueOnce() and .mockResolvedValueOnce() without verifying which APIs were actually called.

After: The test now inspects the URL being requested and returns appropriate responses, with an explicit assertion that the ioBroker API was invoked.

Files Modified:

• packages/plugin-iobroker/src/translate.test.ts - Enhanced fallback test

Verification:

• ✅ All 20 ioBroker plugin tests passing
• ✅ Build successful
• ✅ Linting passes
• ✅ Proper verification of fallback behavior

Original prompt

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This section details on the original issue you should resolve

<issue_title>Enhance Translation in ioBroker plugin to use Deepl Free API</issue_title> <issue_description>Please adjust the translation logic in the ioBroker Plugin so that, when a Deepl API key ENV variable is provided, Deepl is used to translate instead of the current ioBroker translator service</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes AlCalzone/release-script#177

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