Commit local modifications: switch fallback ASR to transformers and update requirements

Fix elevation, POIs, and alerts by bundling pre-compiled track cache and adding Gradio allowed_paths

Remove Docker support, configure Hugging Face for Gradio SDK, add database.py, stage background map tile downloader

feat: smooth marker animations via postMessage and enhanced POI categorization

feat: Phase 2 - Functional simulation, OSM POI Overpass integration, and first-aid RAG

Initial commit: Set up Trailhead structure, Docker, README, and .gitignore