QidiPrinterAgent composes QD_<series>_<vendor>_<typeidx> setting ids from
device enums and previously degraded any slot whose id matched no visible
preset to generic-by-type. Plan v4.2 retires every QD_* preset id to the
succession ledger, so insert the ledger walk between the direct match and
the generic fallback: a composed QD_* id now forwards to its family's
minted OF* successor exactly like every other retired id.
Behavior-neutral until the ids are actually retired (the ledger holds no
QD_* keys yet, and live QD_* presets still match directly).
Also documents the code<->ledger lockstep on the hardcoded non-numeric-
series fallback table (QD_1_0_1/_11/_41/_50) and adds a C++ test pinning
that the succession walk is key-format agnostic.
Gates: libslic3r_tests [filament_id] 14 assertions green; libslic3r_gui
compiles.
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