Route stats background mode through isolated daemon and defer in-app startup to live daemon (#58)

changes/306-stats-background-daemon.md

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+type: fixed
+area: stats
+
+- Stats background mode now routes through the isolated stats daemon instead of starting the regular SubMiner app runtime.

changes/307-stats-background-deferral.md

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+type: fixed
+area: stats
+
+- In-app stats startup now defers to an already-running background stats daemon instead of starting a second stats server.