Migrate PC form + collector off legacy Machine onto the asset/computer model

- PCForm saves/loads via computersApi (asset core + computer extension +
  primary IP in one call); PC Type now uses the dedicated computertypes table
  instead of MachineType, fixing the cross-table id mismatch.
- Collector (/api/collector/*) writes the Computer model: lookup by hostname
  or asset number, update loggedinuser/lastreporteddate/lastboottime + asset
  serial, installed apps via ComputerInstalledApp.
- Add computers.vendorid + modelnumberid (PCs carry make/model) and
  computerinstalledapps.installedversion; computer GET now includes
  communications. Wire COLLECTOR_API_KEY into config.

Retires the last write paths to the Machine model for PCs (ADR-001).

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

shopdb/config.py

@@ -53,6 +53,9 @@ class Config:
 
     LOG_LEVEL = os.environ.get('LOG_LEVEL', 'INFO')
 
+    # API key for the unattended PowerShell collector scripts
+    COLLECTOR_API_KEY = os.environ.get('COLLECTOR_API_KEY', '')
+
     ZABBIX_ENABLED = os.environ.get('ZABBIX_ENABLED', 'false').lower() == 'true'
     ZABBIX_URL = os.environ.get('ZABBIX_URL', '')
     ZABBIX_TOKEN = os.environ.get('ZABBIX_TOKEN', '')