feat: global city search, per-city XGBoost training, SSE progress

fix: add retry logic for Open-Meteo 429 rate limiting

fix: rename __init__.py, remove pressure from predict.py, fix evaluate_model.py paths and columns, fix wind_speed_10m param

feat: migrate to FastAPI/React architecture and expand 7-day forecast metrics

Updated current_weather for API timeout

Changed API to openmeteo and added uncertainity feature