feat(net/socket): implement net reuse port - #2173
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Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.
Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.
Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).
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