(0) PS> curl https://api.deepseek.com/chat/completions `
>>   -H "Content-Type: application/json" `
>>   -H "Authorization: Bearer ${DEEPSEEK_API_KEY}" `
>>   -d '{
>>         "model": "deepseek-v4-flash",
>>         "messages": [
>>           {"role": "system", "content": "You are a helpful assistant."},
>>           {"role": "user", "content": "Hello!"}
>>         ],
>>         "thinking": {"typ...