Problem

First functional DPDK packet I/O - single queue, poll mode.

Sub-tasks

• rte_eth_rx_burst / rte_eth_tx_burst wrappers with Span<T> for zero-copy mbuf access
• Port configuration: link speed, RSS disabled, single RX+TX queue
• Promiscuous mode toggle
• Basic packet forwarding loop (poll mode)

Dependencies

Depends on: #126
Unlocks: #128 (DPDK IPacketTransmitter/Receiver)

Phase

Phase 3 (Advanced Integrations)