Add discovery modes, personalization controls, taste profile page, updated pricing

- Discovery modes: Sonic Twin, Era Bridge, Deep Cuts, Rising Artists
- Discovery dial (Safe to Adventurous slider)
- Block genres/moods exclusion
- Thumbs down/dislike on recommendations
- My Taste page with Genre DNA breakdown, audio feature meters, listening personality
- Updated pricing: Free (5/week), Premium ($6.99/mo), Family ($12.99/mo coming soon)
- Weekly rate limiting instead of daily
- Alembic migration for new fields

backend/app/models/recommendation.py

@@ -29,6 +29,7 @@ class Recommendation(Base):
 
     # User interaction
     saved: Mapped[bool] = mapped_column(Boolean, default=False)
+    disliked: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
     )

backend/app/models/user.py

@@ -22,6 +22,10 @@ class User(Base):
     stripe_customer_id: Mapped[str | None] = mapped_column(String(255), nullable=True, unique=True)
     stripe_subscription_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
 
+    # Personalization
+    blocked_genres: Mapped[str | None] = mapped_column(Text, nullable=True)
+    adventurousness: Mapped[int] = mapped_column(default=3, server_default="3")
+
     # 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)