Use AI-generated translation as primary result in translateDuty

[Copilot]

The translateDuty function requested 3 AI-generated sequences but returned only the preliminary terminology replacement as the main translation, wasting the AI computation.

Changes

• src/lib/military-translator.ts:200: Use first AI-generated result as primary translation with fallback to preliminary translation

return {
  original: duty,
  translated: suggestions[0] || preliminaryTranslation,  // Was: preliminaryTranslation
  suggestions: suggestions,
  confidence: 0.85,
};

This ensures the AI model output is actually utilized while maintaining graceful degradation if generation fails.

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