Split htons to return uint16 instead of int for correct byte order conversion, add htonsInt wrapper that converts uint16 to int for syscall.Socket protocol parameter, update openSocket to use htonsInt for ethPAll protocol value
Add nexafabric-ebpf.go implementing flow collection via Linux raw packet sockets (AF_PACKET) instead of tc/eBPF to enable immediate Proxmox deployment without kernel dependencies, implement packet parsing with VLAN/IP/TCP/UDP/ICMP support and flow aggregation by 5-tuple with vmid/nic/interface/direction metadata extraction from tap/fwbr interface names, add /agents/download/nexafabric-ebpf.go endpoint
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