Replace prompt-action with @actions/ai-inference in translation workflow

[Copilot]

This PR updates the translation workflow to use the official @actions/ai-inference action instead of the custom FidelusAleksander/prompt-action@v1.

Changes Made

• Action Reference: Updated from FidelusAleksander/prompt-action@v1 to actions/ai-inference@v1
• Output Reference: Updated output name from steps.translate.outputs.text to steps.translate.outputs.response

Technical Details

The @actions/ai-inference action provides the same functionality as the custom prompt-action but with standardized output naming conventions. The key difference is that AI inference results are returned via the response output instead of text.

All other workflow parameters remain unchanged:

• system-prompt: Continues to use the built system prompt from the template
• prompt-file: Continues to use the input file path for translation

Validation

• ✅ YAML syntax validation passes
• ✅ Hugo site builds successfully
• ✅ Workflow structure preserved
• ✅ Compatible input parameters maintained

This change improves maintainability by using the official GitHub Actions marketplace action while preserving all existing translation functionality.

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