Initial MVP: full-stack music discovery app

Backend (FastAPI):
- User auth with email/password and Spotify OAuth
- Spotify playlist import with audio feature extraction
- AI recommendation engine using Claude API with taste profiling
- Save/bookmark recommendations
- Rate limiting for free tier (10 recs/day, 1 playlist)
- PostgreSQL models with Alembic migrations
- Redis-ready configuration

Frontend (React 19 + TypeScript + Vite + Tailwind):
- Landing page, auth flows (email + Spotify OAuth)
- Dashboard with stats and quick discover
- Playlist management and import from Spotify
- Discover page with custom query support
- Recommendation cards with explanations and save toggle
- Taste profile visualization
- Responsive layout with mobile navigation
- PWA-ready configuration

Infrastructure:
- Docker Compose with PostgreSQL, Redis, backend, frontend
- Environment-based configuration

backend/app/models/user.py

@@ -0,0 +1,32 @@
+from datetime import datetime, timezone
+
+from sqlalchemy import String, Boolean, DateTime, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    email: Mapped[str] = mapped_column(String(255), unique=True, index=True)
+    name: Mapped[str] = mapped_column(String(255))
+    hashed_password: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    is_pro: Mapped[bool] = mapped_column(Boolean, default=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
+    )
+
+    # Spotify OAuth
+    spotify_id: Mapped[str | None] = mapped_column(String(255), nullable=True, unique=True)
+    spotify_access_token: Mapped[str | None] = mapped_column(Text, nullable=True)
+    spotify_refresh_token: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    # Relationships
+    playlists: Mapped[list["Playlist"]] = relationship(back_populates="user", cascade="all, delete-orphan")
+    recommendations: Mapped[list["Recommendation"]] = relationship(back_populates="user", cascade="all, delete-orphan")
+
+
+from app.models.playlist import Playlist  # noqa: E402
+from app.models.recommendation import Recommendation  # noqa: E402