Lift the multi-step deploy wizard (~520 LOC) plus its private
INI-builder helpers (PLACEHOLDER_LINES, b64encodeUtf8, buildIni,
PickMode type) into their own file. Verbatim move; the
underscore-prefixed helpers drop the leading underscore now that
they're file-local rather than competing with hoisted parent
constants.
- New DeckyFleet/DeployWizard.tsx
- DeployWizard.test.tsx covers the closed render guard, the
open-at-step-0 archetype list, NEXT-disabled-until-archetype,
and CANCEL -> onClose. ServiceConfigFields is vi.mock'd to a
stub since it pulls schemas via api.get() that are out of
scope for these tests.
- DeckyFleet.tsx loses the wizard plus the now-unused imports
(DEFAULT_SERVICES, Modal, PickIcon, ServiceConfigFields and
its type aliases).
