Introduces five new SQLModel tables for MazeNET (nested deception topologies): Topology, LAN, TopologyDecky, TopologyEdge, and TopologyStatusEvent. DeckyShard is intentionally not touched — TopologyDecky is a purpose-built sibling for MazeNET's lifecycle (topology-scoped UUIDs, per-topology name uniqueness). Part of MazeNET v1 (nested self-container network-of-networks).