Match template exactly: remove sys.path, add explicit template/static folders

site/app.py

@@ -1,12 +1,6 @@
-"""Точка входа — минимальное приложение."""
-import os
-import sys
-
-sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
-
 from flask import Flask, render_template
 
-app = Flask(__name__)
+app = Flask(__name__, template_folder="templates", static_folder="static")
 
 
 @app.route("/")
@@ -15,4 +9,4 @@ def index():
 
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5000)
+    app.run(debug=True, host="0.0.0.0", port=5000)