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This commit adds Xn and N2 handover procedures to the Home-Routed Roaming code. Direct forwarding is now fully operational. Indirect forwarding for N2 handovers is not yet supported. To preserve the GTP-U header and extension header (even without QER) along the source gNB -> V-UPF -> target gNB path, future work will create PDRs without Outer Header Removal IE and FARs without Outer Header Creation IE and implement the necessary UPF logic.