feat: expand livestream management platform

backend/models/stream.py

@@ -23,6 +23,7 @@ class Stream(Base):
     replay_file: Mapped[str | None] = mapped_column(String(500), nullable=True)
     chapters_json: Mapped[str | None] = mapped_column(Text, nullable=True)
     transcode_profile: Mapped[str] = mapped_column(String(64), default="standard")
+    renditions_json: Mapped[str | None] = mapped_column(Text, nullable=True)
     homepage_visible: Mapped[bool] = mapped_column(Boolean, default=True)
     remote_control_enabled: Mapped[bool] = mapped_column(Boolean, default=False)
     stream_key: Mapped[str] = mapped_column(String(64), unique=True, default=lambda: uuid.uuid4().hex)