Rebuild frontend with Tailwind CSS + fix Python 3.14 compatibility

- Upgrade SQLAlchemy 2.0.27→2.0.45, google-genai SDK for Python 3.14
- Replace google-generativeai with google-genai in narrative_service.py
- Fix HTTPException handling in main.py (was wrapping as 500)
- Rebuild all frontend components with Tailwind CSS v3:
  - Dashboard, NarrativeSection, StatsGrid, VibeRadar, HeatMap, TopRotation
  - Custom color palette (background-dark, card-dark, accent-neon, etc.)
  - Add glass-panel, holographic-badge CSS effects
- Docker improvements:
  - Combined backend container (API + worker in entrypoint.sh)
  - DATABASE_URL configurable via env var
  - CI workflow builds both backend and frontend images
- Update README with clearer docker-compose instructions

docker-compose.yml

@@ -1,4 +1,5 @@
 version: '3.8'
+
 services:
   backend:
     build:
@@ -7,20 +8,35 @@ services:
     container_name: music-analyser-backend
     restart: unless-stopped
     volumes:
-      - /opt/mySpotify/music.db:/app/music.db
+      - music_data:/app/data
     environment:
+      - DATABASE_URL=sqlite:////app/data/music.db
       - SPOTIFY_CLIENT_ID=${SPOTIFY_CLIENT_ID}
       - SPOTIFY_CLIENT_SECRET=${SPOTIFY_CLIENT_SECRET}
       - SPOTIFY_REFRESH_TOKEN=${SPOTIFY_REFRESH_TOKEN}
       - GEMINI_API_KEY=${GEMINI_API_KEY}
+      - GENIUS_ACCESS_TOKEN=${GENIUS_ACCESS_TOKEN}
     ports:
       - '8000:8000'
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
   frontend:
     build:
       context: ./frontend
+    image: ghcr.io/bnair123/musicanalyser-frontend:latest
     container_name: music-analyser-frontend
     restart: unless-stopped
     ports:
       - '8991:80'
     depends_on:
-      - backend
+      backend:
+        condition: service_healthy
+
+volumes:
+  music_data:
+    driver: local