Adapt openai.py to work with xAI (#16903)

* Adapt openai.py to work with xAI

It appears xAI is a bit more strict in regards to how the prompt is sent. This changes the prompt to be a dictionary with `"type": "text"` which works with OpenAI and xAI.

* Adapt openai.py to work with xAI

add "detail": "low"

* Adapt openai.py to work with xAI

Apply Ruff formatting and linting fixes

frigate/genai/openai.py

@@ -26,13 +26,9 @@ class OpenAIClient(GenAIClient):
     def _send(self, prompt: str, images: list[bytes]) -> Optional[str]:
         """Submit a request to OpenAI."""
         encoded_images = [base64.b64encode(image).decode("utf-8") for image in images]
-        try:
-            result = self.provider.chat.completions.create(
-                model=self.genai_config.model,
-                messages=[
-                    {
-                        "role": "user",
-                        "content": [
+        messages_content = []
+        for image in encoded_images:
+            messages_content.append(
                 {
                     "type": "image_url",
                     "image_url": {
@@ -40,9 +36,20 @@ class OpenAIClient(GenAIClient):
                         "detail": "low",
                     },
                 }
-                            for image in encoded_images
-                        ]
-                        + [prompt],
+            )
+        messages_content.append(
+            {
+                "type": "text",
+                "text": prompt,
+            }
+        )
+        try:
+            result = self.provider.chat.completions.create(
+                model=self.genai_config.model,
+                messages=[
+                    {
+                        "role": "user",
+                        "content": messages_content,
                     },
                 ],
                 timeout=self.timeout,