Network component

src/sakia/data/connectors/node.py

src/sakia/data/entities/node.py

src/sakia/data/repositories/meta.sql

src/sakia/data/repositories/nodes.py

src/sakia/gui/navigation/model.py

src/sakia/gui/navigation/network/controller.py

src/sakia/gui/navigation/network/model.py

src/sakia/gui/navigation/network/table_model.py

src/sakia/services/network.py