Three issues fixed:
1. Start/stop returned 404 for forwards owned by other nodes:
findLinkByTriple only checked local SQLite store. Added
findLinkFromTopology fallback — startForward/stopForward now look up
ring topology entries when the local store doesn't have the link.
2. Group labels didn't sync through the ring:
handleForwardsAssign only updated local SQLite, never the ring
topology. Added State.UpdateTopologyGroup + Engine.UpdateTopologyGroup
— handleForwardsAssign now updates both. Added topologySync callback
called after every e.state = tk.State (OnToken) and e.state = s
(AdoptState) to re-apply local store group overrides onto the freshly
adopted topology, so they survive state adoption and propagate via
the next token forward. handleForwardsGroupDelete also clears ring
topology entries.
3. Status-merge branch omitted Group field:
ring-only forwards always showed '未分组'. Added Group: t.Link.Group
to the topology-merge forwardStatus.
Verified: 4-node cluster, 5 forwards, group assigned on node-a
propagates to all nodes within one token cycle; stop from non-owning
node succeeds (HTTP 200) and worker stops on the owning node.
