feat:음성입력 STT 사용량 AI 토큰 추적 연동

logSttUsage 엔드포인트 추가, 녹음 종료 시 duration 전송
AI 토큰 사용량에 '공사현장사진대지-음성입력' 카테고리로 기록

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/Juil/ConstructionSitePhotoController.php

@@ -2,6 +2,7 @@
 
 namespace App\Http\Controllers\Juil;
 
+use App\Helpers\AiTokenHelper;
 use App\Http\Controllers\Controller;
 use App\Models\Juil\ConstructionSitePhoto;
 use App\Services\ConstructionSitePhotoService;
@@ -233,4 +234,15 @@ public function downloadPhoto(Request $request, int $id, string $type): Response
             ->header('Content-Disposition', "{$disposition}; filename=\"{$encodedFilename}\"; filename*=UTF-8''{$encodedFilename}")
             ->header('Cache-Control', 'private, max-age=3600');
     }
+
+    public function logSttUsage(Request $request): JsonResponse
+    {
+        $validated = $request->validate([
+            'duration_seconds' => 'required|integer|min:1',
+        ]);
+
+        AiTokenHelper::saveSttUsage('공사현장사진대지-음성입력', $validated['duration_seconds']);
+
+        return response()->json(['success' => true]);
+    }
 }