Fix LAN service cleanup after disconnect

[calcitem]

Summary

• keep the LAN NetworkService reusable after disconnects by separating cleanup from full disposal
• resolve pending protocol handshakes during teardown to avoid dangling futures
• improve logging around disconnect-driven resets

Testing

• ./format.sh s (fails: dart not available in container)

---

https://chatgpt.com/codex/tasks/task_e_68eb6e4e99288320a2c3959ef52108af

[github-actions]

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Unrecognized words (27)

Ctl
CXXFLAGS
deinitialize
depthext
edt
efmr
evals
ewt
fal
fmr
gameplay
glm
Hms
imbalanced
kimi
MMdd
moonshotai
movetime
nmove
occ
sid
STEB
subtag
toremove
tru
workaround
zhiqi

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❌ Errors and Warnings	Count
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⚠️ ignored-expect-variant	3

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud