docs(byteplus): register provider endpoints support and cover image dispatch

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

provider_endpoints_support.json

@@ -439,6 +439,22 @@
         "interactions": true
       }
     },
+    "byteplus": {
+      "display_name": "BytePlus (`byteplus`)",
+      "url": "https://docs.litellm.ai/docs/providers/byteplus",
+      "endpoints": {
+        "chat_completions": false,
+        "messages": false,
+        "responses": false,
+        "embeddings": false,
+        "image_generations": true,
+        "audio_transcriptions": false,
+        "audio_speech": false,
+        "moderations": false,
+        "batches": false,
+        "rerank": false
+      }
+    },
     "bytez": {
       "display_name": "Bytez (`bytez`)",
       "url": "https://docs.litellm.ai/docs/providers/bytez",

tests/test_litellm/llms/byteplus/image_generation/test_byteplus_image_gen_transformation.py

@@ -6,6 +6,7 @@ import pytest
 
 sys.path.insert(0, os.path.abspath("../../../../.."))
 
+import litellm
 from litellm import get_llm_provider
 from litellm.llms.byteplus.image_generation.transformation import (
     DEFAULT_API_BASE,
@@ -221,6 +222,28 @@ class TestBytePlusImageGenerationTransformation:
                 encoding=None,
             )
 
+    def test_image_generation_dispatches_to_byteplus_handler(self):
+        fake_response = MagicMock()
+
+        with patch.object(
+            litellm.images.main.llm_http_handler,
+            "image_generation_handler",
+            return_value=fake_response,
+        ) as mock_handler:
+            result = litellm.image_generation(
+                model="byteplus/seedream-5-0-260128",
+                prompt="a cat surfing a wave",
+                api_key="sk-test",
+            )
+
+        assert result is fake_response
+        mock_handler.assert_called_once()
+        kwargs = mock_handler.call_args.kwargs
+        assert kwargs["custom_llm_provider"] == "byteplus"
+        assert kwargs["model"] == "seedream-5-0-260128"
+        assert kwargs["prompt"] == "a cat surfing a wave"
+        assert isinstance(kwargs["image_generation_provider_config"], BytePlusImageGenerationConfig)
+
     def test_transform_response_json_parse_error_raises(self):
         mock_response = MagicMock()
         mock_response.status_code = 200