Change from litellm to openrouter

[danielmlow]

https://openrouter.ai/docs/models

Advantages:

• Single API key for all models
• Free models

response = requests.post(
	url="https://openrouter.ai/api/v1/chat/completions",
	headers={
	  "Authorization": f"Bearer {OPENROUTER_API_KEY}",
	  # "HTTP-Referer": f"{YOUR_SITE_URL}", # Optional, for including your app on openrouter.ai rankings.
	  # "X-Title": f"{YOUR_APP_NAME}", # Optional. Shows in rankings on openrouter.ai.
	},
	data=json.dumps({
	  "model": "openai/gpt-4o", # Optional
	  "messages": [
		{ "role": "user", "content": prompt}
	  ]

	})
	)


data = json.loads(response.text.strip())
final_result = data['choices'][0]['message']['content']