docs: feasibility study for official SagerNet/sing-box switch

[hawkff]

Docs-only. Read-only investigation of switching the core from starifly/sing-box to official SagerNet/sing-box (requested).

Conclusion: NOT a drop-in switch. Findings:

• Fork chain: SagerNet/sing-box -> MatsuriDayo/sing-box -> starifly/sing-box (this fork's core, ~v1.12.19). Official latest stable is v1.13.13.
• libcore imports Matsuri-only packages absent from official: nekoutils, protocol/shadowsocksr, protocol/snell.
• Official protocol/ dir (v1.13.13) lacks shadowsocksr, snell, juicity.
• App exposes SSR (TYPE_SSR=3), Snell (TYPE_SNELL=24), Juicity (TYPE_JUICITY=23) as first-class profile types (8-11 files each) + a 4830-line SingBoxOptions.java schema mirroring the fork.
• Switching = re-platforming (rewrite libcore bindings, re-derive schema, drop/re-source protocols, re-validate everything): weeks, high regression risk.

Recommendation: keep the starifly core; for newer upstream features, wait for starifly/Matsuri to rebase onto newer official, or backport specific features. Full re-platform is a separate product decision.

No functional app changes.

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Reviewing files that changed from the base of the PR and between 5889145 and 7712c5b.

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• docs/maintenance/official-singbox-feasibility.md

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