Added pytest configuration and first 4 unit tests

app/main.py

@@ -1,9 +1,19 @@
 
+from fastapi.concurrency import asynccontextmanager
 from app.routers import channels, auth, playlist, priorities
 from fastapi import FastAPI
 from fastapi.openapi.utils import get_openapi
 
+from app.utils.database import init_db
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Initialize database tables on startup
+    init_db()
+    yield
+
 app = FastAPI(
+    lifespan=lifespan,
     title="IPTV Updater API",
     description="API for IPTV Updater service",
     version="1.0.0",