new app store links feature

backend/app/models.py

@@ -98,6 +98,11 @@ class StationConfig(Base):
     stream_url = Column(String(500), nullable=False, default="")
     stream_metadata_url = Column(String(500), nullable=False, default="")
 
+    # Mobile app download links
+    play_store_icon_url = Column(String(500), nullable=False, default="")
+    play_store_url = Column(String(500), nullable=False, default="")
+    app_store_embed_html = Column(Text, nullable=False, default="")
+
 
 class HistoryEntry(Base):
     __tablename__ = "history_entries"