feat(docker): containerize application and add TTS integration

api/main.py

@@ -0,0 +1,83 @@
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+from typing import Optional
+import uvicorn
+
+from chat_service import ChatService
+
+
+# 请求和响应模型
+class ChatRequest(BaseModel):
+    message: str
+    user_id: Optional[str] = None
+    include_audio: Optional[bool] = True
+
+
+class ChatResponse(BaseModel):
+    success: bool
+    response: Optional[str] = None
+    tokens: Optional[int] = None
+    user_id: str
+    error: Optional[str] = None
+    audio_data: Optional[str] = None  # base64 编码的音频数据
+    audio_error: Optional[str] = None
+
+
+# 创建 FastAPI 应用
+app = FastAPI(
+    title="Haystack RAG API",
+    description="基于 Haystack 的 RAG 聊天服务 API",
+    version="1.0.0"
+)
+
+# 全局聊天服务实例
+chat_service = ChatService()
+
+
+@app.on_event("startup")
+async def startup_event():
+    """应用启动时初始化聊天服务"""
+    chat_service.initialize()
+
+
+@app.get("/")
+async def root():
+    """根路径，返回 API 信息"""
+    return {"message": "Haystack RAG API is running", "version": "1.0.0"}
+
+
+@app.get("/health")
+async def health_check():
+    """健康检查端点"""
+    return {"status": "healthy"}
+
+
+@app.post("/chat", response_model=ChatResponse)
+async def chat_endpoint(request: ChatRequest):
+    """
+    聊天接口
+    
+    接收用户消息，通过 RAG 管道处理并返回回复（可包含 base64 音频数据）
+    """
+    try:
+        # 如果请求中指定了用户ID，创建新的服务实例
+        if request.user_id and request.user_id != chat_service.user_id:
+            user_chat_service = ChatService(request.user_id)
+            user_chat_service.initialize()
+            result = user_chat_service.chat(request.message, request.include_audio)
+        else:
+            result = chat_service.chat(request.message, request.include_audio)
+        
+        return ChatResponse(**result)
+        
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")
+
+
+if __name__ == "__main__":
+    uvicorn.run(
+        "main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True
+    )