update:1.优化 AI 流式生成和进度显示系统 2.新增写作风格系统提示词支持 3.灵感模式功能增强,支持灵感重写 4.设置页面功能扩展，新增Gemini适配器 5.提示词模板系统优化，调整灵感模式提示词

backend/app/services/ai_clients/openai_client.py

@@ -0,0 +1,101 @@
+"""OpenAI 客户端"""
+import json
+from typing import Any, AsyncGenerator, Dict, Optional
+
+from app.logger import get_logger
+from .base_client import BaseAIClient
+
+logger = get_logger(__name__)
+
+
+class OpenAIClient(BaseAIClient):
+    """OpenAI API 客户端"""
+
+    def _build_headers(self) -> Dict[str, str]:
+        return {
+            "Authorization": f"Bearer {self.api_key}",
+            "Content-Type": "application/json",
+        }
+
+    def _build_payload(
+        self,
+        messages: list,
+        model: str,
+        temperature: float,
+        max_tokens: int,
+        tools: Optional[list] = None,
+        tool_choice: Optional[str] = None,
+        stream: bool = False,
+    ) -> Dict[str, Any]:
+        payload = {
+            "model": model,
+            "messages": messages,
+            "temperature": temperature,
+            "max_tokens": max_tokens,
+        }
+        if stream:
+            payload["stream"] = True
+        if tools:
+            # 清理 $schema 字段
+            cleaned = []
+            for t in tools:
+                tc = t.copy()
+                if "function" in tc and "parameters" in tc["function"]:
+                    tc["function"]["parameters"] = {
+                        k: v for k, v in tc["function"]["parameters"].items() if k != "$schema"
+                    }
+                cleaned.append(tc)
+            payload["tools"] = cleaned
+            if tool_choice:
+                payload["tool_choice"] = tool_choice
+        return payload
+
+    async def chat_completion(
+        self,
+        messages: list,
+        model: str,
+        temperature: float,
+        max_tokens: int,
+        tools: Optional[list] = None,
+        tool_choice: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        payload = self._build_payload(messages, model, temperature, max_tokens, tools, tool_choice)
+        data = await self._request_with_retry("POST", "/chat/completions", payload)
+
+        choices = data.get("choices", [])
+        if not choices or len(choices) == 0:
+            raise ValueError("API 返回空 choices 或 choices 为空列表")
+
+        choice = choices[0]
+        message = choice.get("message", {})
+        return {
+            "content": message.get("content", ""),
+            "tool_calls": message.get("tool_calls"),
+            "finish_reason": choice.get("finish_reason"),
+        }
+
+    async def chat_completion_stream(
+        self,
+        messages: list,
+        model: str,
+        temperature: float,
+        max_tokens: int,
+    ) -> AsyncGenerator[str, None]:
+        payload = self._build_payload(messages, model, temperature, max_tokens, stream=True)
+        
+        async with await self._request_with_retry("POST", "/chat/completions", payload, stream=True) as response:
+            response.raise_for_status()
+            async for line in response.aiter_lines():
+                if line.startswith("data: "):
+                    data_str = line[6:]
+                    if data_str.strip() == "[DONE]":
+                        break
+                    try:
+                        data = json.loads(data_str)
+                        choices = data.get("choices", [])
+                        if choices and len(choices) > 0:
+                            content = choices[0].get("delta", {}).get("content", "")
+                            if content:
+                                yield content
+                    except json.JSONDecodeError:
+                        continue