Collector: ingest GE-Enforce/enrollment data with configurable pc-type mapping

Extends the computers collector so it can replace the classic api.asp
updateCompleteAsset path that the shopfloor PC fleet uses to auto-update data.

Collector schema (project naming) now accepts the GE-Enforce/enrollment shape:
machinenumber, pctype, pcsubtype, serialnumber, loggedinuser, lastboottime,
lastcheckin, ipaddress, vendorname, modelnumber, osname, installedsoftware.
- machinenumber -> Asset.assetnumber (skips the 9999 imaging placeholder, falls
  back to hostname), on create and update.
- pctype -> ComputerType via a configurable mapping (see below).
- vendor/model created if missing (free vocab); OS looked up (controlled, warns
  if unknown); pcsubtype accepted but not yet stored (warning).
- Dropped per scope: VNC/WinRM flags, warranty, DNC config, multi-NIC.

Configurable pc-type mapping (the gea-shopfloor-* imaging taxonomy ->
ComputerType): defaults + resolution live in plugins/computers/pctypemap.py
(plugin domain, contract-pure - reads Setting via shopdb.api); overrides stored
as pctypemap_<pxetype> settings, seeded on plugin install, edited in Settings >
System > "Collector PC Type Mapping" (new UI section).

Migration doc: docs/COLLECTOR-INTEGRATION.md maps classic api.asp fields +
GE-Enforce status fields to the collector schema, documents machine-number
sourcing (registry MachineNo first, then C:\Enrollment\machine-number.txt) and
that the transport is interim.

Tests: complete-asset payload maps machinenumber/pctype/vendor/model/os; 9999
placeholder falls back to hostname. 186 tests pass, naming green, app boots,
mapping UI verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shopdb/core/api/settings.py

@@ -43,7 +43,6 @@ SEARCH_DOMAINS = {
     'subnet': 'Subnets',
 }
 
-
 def _is_secret(key: str) -> bool:
     return 'password' in key or 'token' in key or 'secret' in key
 
@@ -210,6 +209,8 @@ def build_default_settings():
         for key, label in SEARCH_DOMAINS.items()
     ]
 
+    # Collector pc-type -> ComputerType mapping is computers-plugin domain;
+    # the plugin seeds pctypemap_<pxetype> settings on install.
     defaults = identifierdefaults + searchdefaults + [
         # Zabbix integration
         {