Per-profile remote hosts (#39778) wired the chat/resume socket to a profile's
remote backend, but session list + transcript reads still assumed every
profile's state.db is a local file the primary can open. For a remote profile
the local file is absent or stale, so the IDs the sidebar shows 404 the moment
resume runs against the remote -- the "session not found -> new session" bug.
Intercept the three session-read GETs in the hermes:api handler and route them
to the owning remote backend (which serves its own state.db natively):
GET /api/profiles/sessions -> splice each remote profile's real rows in
GET /api/sessions/{id}[/messages] -> read from the remote for remote profiles
No remote profiles configured -> untouched local fast path. A dead remote
contributes nothing rather than breaking the sidebar.
Verified end-to-end against a live remote backend: a remote-profile session
resumes from remote history and continues on the remote across turns (history
grows in place, no new session spawned).
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