feat: Fix nutrition service and add location-based alerts

Changes:
- Fix nutrition service: add is_active column and Pydantic validation for UUID/datetime
- Add location-based alerts feature: users can now see alerts within 1km radius
- Fix CORS and response serialization in nutrition service
- Add getCurrentLocation() and loadAlertsNearby() functions
- Improve UI for nearby alerts display with distance and response count

run_frontend.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Запуск простого HTTP сервера для фронтенда
+
+PORT=8888
+
+echo "🌐 Запуск веб-сервера на порту $PORT..."
+echo "📝 Открыте браузер и перейдите на: http://localhost:$PORT/frontend_test.html"
+echo ""
+echo "Для остановки сервера нажмите Ctrl+C"
+echo ""
+
+cd "$(dirname "$0")"
+
+# Python 3
+python3 -m http.server $PORT --bind 127.0.0.1