add ai image base

ai_service/llm/adapter/openai.py

@@ -0,0 +1,25 @@
+from llm.base import MultiModalAICapability
+from langchain_openai import ChatOpenAI
+# from openai import OpenAI # 如需图片/音频/视频等API
+
+class OpenAIAdapter(MultiModalAICapability):
+    def __init__(self, api_key, model, **kwargs):
+        self.llm = ChatOpenAI(api_key=api_key, model=model, streaming=True)
+        self.api_key = api_key
+
+    async def chat(self, messages, **kwargs):
+        return await self.llm.ainvoke(messages)
+
+    async def stream_chat(self, messages, **kwargs):
+        async for chunk in self.llm.astream(messages):
+            yield chunk
+
+    # 如需图片生成（DALL·E），可实现如下
+    def create_image_task(self, prompt, **kwargs):
+        # 伪代码，需用 openai.Image.create
+        # import openai
+        # response = openai.Image.create(api_key=self.api_key, prompt=prompt, ...)
+        # return response
+        raise NotImplementedError("OpenAI 图片生成请用 openai.Image.create 实现")
+
+    # 其他能力同理