=== TEST COUNTING S3 FILES ===

Test 1: Đếm nhanh (chỉ số lượng file)
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{"status":"success","prefix":"correction_audio","total_files":0}

Test 2: Đếm chi tiết (có size, extension, course)
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{
    "status": "success",
    "prefix": "correction_audio",
    "total_files": 0,
    "total_size_bytes": 0,
    "total_size_mb": 0,
    "total_size_gb": 0,
    "files_by_extension": [],
    "files_by_course": []
}

Test 3: Đếm file của course 46
---------------------------------------
{
    "status": "success",
    "prefix": "correction_audio\/46",
    "total_files": 0,
    "total_size_bytes": 0,
    "total_size_mb": 0,
    "total_size_gb": 0,
    "files_by_extension": [],
    "files_by_course": []
}

=== DONE ===