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_providers/openai_provider.py

@@ -0,0 +1,57 @@
+"""OpenAI Provider"""
+from typing import Any, AsyncGenerator, Dict, List, Optional
+
+from app.services.ai_clients.openai_client import OpenAIClient
+from .base_provider import BaseAIProvider
+
+
+class OpenAIProvider(BaseAIProvider):
+    """OpenAI 提供商"""
+
+    def __init__(self, client: OpenAIClient):
+        self.client = client
+
+    async def generate(
+        self,
+        prompt: str,
+        model: str,
+        temperature: float,
+        max_tokens: int,
+        system_prompt: Optional[str] = None,
+        tools: Optional[List[Dict]] = None,
+        tool_choice: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        messages = []
+        if system_prompt:
+            messages.append({"role": "system", "content": system_prompt})
+        messages.append({"role": "user", "content": prompt})
+
+        return await self.client.chat_completion(
+            messages=messages,
+            model=model,
+            temperature=temperature,
+            max_tokens=max_tokens,
+            tools=tools,
+            tool_choice=tool_choice,
+        )
+
+    async def generate_stream(
+        self,
+        prompt: str,
+        model: str,
+        temperature: float,
+        max_tokens: int,
+        system_prompt: Optional[str] = None,
+    ) -> AsyncGenerator[str, None]:
+        messages = []
+        if system_prompt:
+            messages.append({"role": "system", "content": system_prompt})
+        messages.append({"role": "user", "content": prompt})
+
+        async for chunk in self.client.chat_completion_stream(
+            messages=messages,
+            model=model,
+            temperature=temperature,
+            max_tokens=max_tokens,
+        ):
+            yield chunk