Add backend api and engine

api/app/main.py

@@ -0,0 +1,72 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
+import os
+
+from .db import Base, engine
+from .routers import assistants, history
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # 启动时创建表
+    Base.metadata.create_all(bind=engine)
+    yield
+
+
+app = FastAPI(
+    title="AI VideoAssistant API",
+    description="Backend API for AI VideoAssistant",
+    version="1.0.0",
+    lifespan=lifespan
+)
+
+# CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# 路由
+app.include_router(assistants.router, prefix="/api")
+app.include_router(history.router, prefix="/api")
+
+
+@app.get("/")
+def root():
+    return {"message": "AI VideoAssistant API", "version": "1.0.0"}
+
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}
+
+
+# 初始化默认数据
+@app.on_event("startup")
+def init_default_data():
+    from sqlalchemy.orm import Session
+    from .db import SessionLocal
+    from .models import Voice
+    
+    db = SessionLocal()
+    try:
+        # 检查是否已有数据
+        if db.query(Voice).count() == 0:
+            # 插入默认声音
+            voices = [
+                Voice(id="v1", name="Xiaoyun", vendor="Ali", gender="Female", language="zh", description="Gentle and professional."),
+                Voice(id="v2", name="Kevin", vendor="Volcano", gender="Male", language="en", description="Deep and authoritative."),
+                Voice(id="v3", name="Abby", vendor="Minimax", gender="Female", language="en", description="Cheerful and lively."),
+                Voice(id="v4", name="Guang", vendor="Ali", gender="Male", language="zh", description="Standard newscast style."),
+                Voice(id="v5", name="Doubao", vendor="Volcano", gender="Female", language="zh", description="Cute and young."),
+            ]
+            for v in voices:
+                db.add(v)
+            db.commit()
+            print("✅ 默认声音数据已初始化")
+    finally:
+        db.close()