fix(client): Stop/Restart buttons and an autostart toggle on the Node page

Root cause of both reports: node:service-status's `installed` field was
winAutostartInstalled() -- whether the Startup-folder launcher exists --
not whether the daemon can be managed at all. The Node page gates
Stop/Restart on `installed`, so with no autostart configured (the default
-- nothing installs it automatically) those buttons silently never
rendered, leaving only Start. A perfectly manageable daemon looked
unmanageable because a different, unrelated setting was off.

installed now reflects the actual daemon binary (findNodeBinary()), same
definition node:installed already used; autostart moves to its own field
carrying what installed used to mean.

That field also fixes the other half: there was no way to turn autostart
on except the CLI. NodeServicePanel now shows a toggle-switch next to
Start/Stop/Restart, wired through a new platform.node.autostart
(install/remove) that mirrors the existing service.* pattern -- the
preload/main.js bridge (W3) was already there, just never called from the
interface. English and French strings; other locales fall back to English
per the project's own stated policy (test_locales.py's own docstring).

Verified: node --check on every edited file; hub/node suites green
(863 pass, 0 fail — pre-existing test_locales.py encoding failures on
this Windows checkout are unrelated, reproduced identically on the
clean tree).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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