Add designation prefixes for 56 categories under 20_manufacturers_articles

[ispyisail]

Where this comes from

This is a follow-up to #70 (first batch, 10_allpole/11_singlepole), which
was the data half of qelectrotech-source-mirror discussion
#666
(IEC 81346 designation letter) and PR
#668
(the mechanism that reads this file — autonum::elementPrefixForLocation(),
exposed as the %prefix label-formula variable).

More recently this became item 2 of REFACTOR-BACKLOG.md Tier 2 in
qelectrotech-docker,
which was itself written from a review of scorpio810's own refactor roadmap
(refonte_du_code_de_qelectrotech on the QET wiki) — that doc separately
proposes "a standards file mapping element types to letter codes", which
qet_labels.xml already is, just under-filled-in. This PR is coverage
work against that same file, not a new mechanism.

What this does

Second batch from tools/iec81346 (in qelectrotech-docker), same tooling
and safety rules as #70. Covers manufacturer-specific PLC controllers,
safety switches, frequency drives, softstarters, sensors, power supplies,
relays, and a few allpole/graphics categories #70 didn't touch.

Every insertion is a one-line addition to a category the file already
lists — no new <category> nodes, no reformatting elsewhere.

Verification

• Scored against the file's own gate: 0 contradictions with the 82
  hand-curated entries.

• The tool proposed 60 candidates; I sampled every one by hand against its
  actual element contents rather than trusting the tool's own confidence.
  4 were dropped as false positives the existing safety rules can't see (a
  flat folder with no sub-categories has nothing to disagree with
  internally, so the "subtree wants a different prefix" check never fires
  even when the folder mixes device types):

  • 20_manufacturers_articles/guitar/pickups → matched the bare "coil"
    keyword, but a guitar pickup isn't a relay coil.
  • 20_manufacturers_articles/knx/actionneur → mostly generic
    binary/analog I/O modules, not motors; also contains a valve and a
    heater.
  • 20_manufacturers_articles/knx/capteurs → mixes real sensors with
    switches, a timer, and an alarm.
  • 20_manufacturers_articles/siemens/01_PLC_controllers/et200s/power_supply
    → its one actual element is a terminal module, not a power supply.

  (A small --exclude flag was added to propose_labels.py for this —
  companion commit in qelectrotech-docker.)

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