fix: add root route to serve index.html

app.py

@@ -7,7 +7,13 @@ import time
 from flask import Flask, request, jsonify, send_file
 from yt_dlp import YoutubeDL
 
-app = Flask(__name__)
+app = Flask(__name__, static_folder=".", static_url_path="")
+
+
+@app.route("/")
+def index():
+    return app.send_static_file("index.html")
+
 
 TASKS_DIR = "tasks"
 if not os.path.exists(TASKS_DIR):