YueGuobin fd4ac4460d
feat: migrate builtin EthernetSwitch from Dynamips ethsw to ubridge brctl
Replace the builtin EthernetSwitch stub with a Linux kernel bridge backed
by uBridge's brctl module. Each switch node creates one kernel bridge
(gns3br{N}) with VLAN filtering; each port is a persistent TAP enslaved to
the bridge, relayed by a per-port uBridge bridge (nio_tap <-> nio_udp).

- Access/dot1q/qinq port modes translated to brctl vlan primitives
- Compute router repointed from Dynamips to Builtin manager
- Tests updated: 21 router-level tests + 215 surrounding tests pass
- Real-kernel e2e verified: access 100 PVID untagged, dot1q trunk
  VIDs 1-4094 + native 1, qinq 802.1ad proto + 200 PVID

Ethertype 0x9100/0x9200 handling and port-count guard relaxation are
deferred pending resolution.
2026-07-18 00:21:19 +08:00
..
2026-07-08 18:45:07 +02:00
2026-04-04 19:55:13 +08:00
2026-07-09 08:40:05 +02:00
2024-04-22 18:51:29 +07:00
2026-07-09 10:40:38 +02:00
2022-01-19 22:28:36 +10:30
2026-07-10 10:01:35 +02:00