Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

tests/test_plugins/test_pc_default_printer.py

@@ -0,0 +1,69 @@
+"""Tests for the per-PC default-printer endpoint (/api/printers/pc-default).
+
+Parity with classic apipcdefaultprinter.asp: the signed printer-installer EXE
+preselects a PC's default printer by machine (asset) number. The link is a
+`defaultprinter` asset relationship (PC asset -> printer asset).
+"""
+
+import pytest
+
+from shopdb.core.models import Asset, AssetType, AssetRelationship, RelationshipType
+from plugins.printers.models import Printer
+
+
+@pytest.fixture
+def scene(db):
+    """A PC asset, a printer asset, and the defaultprinter relationship type."""
+    pc_type = AssetType(assettype='computer', pluginname='computers', tablename='computers')
+    pr_type = AssetType(assettype='printer', pluginname='printers', tablename='printers')
+    dp_type = RelationshipType(relationshiptype='defaultprinter', description='PC to default printer')
+    db.session.add_all([pc_type, pr_type, dp_type])
+    db.session.flush()
+
+    pc = Asset(assetnumber='3210', name='CSF04 PC', assettypeid=pc_type.assettypeid, isactive=True)
+    pr_asset = Asset(assetnumber='PRN-01', name='Materials HP', assettypeid=pr_type.assettypeid, isactive=True)
+    db.session.add_all([pc, pr_asset])
+    db.session.flush()
+
+    printer = Printer(assetid=pr_asset.assetid, windowsname='HP-CSF04-Materials')
+    db.session.add(printer)
+    db.session.commit()
+
+    return {'pc': pc, 'printer_asset': pr_asset, 'printer': printer, 'dp_type': dp_type}
+
+
+def _link_default(db, pc, printer_asset, dp_type):
+    db.session.add(AssetRelationship(
+        sourceassetid=pc.assetid,
+        targetassetid=printer_asset.assetid,
+        relationshiptypeid=dp_type.relationshiptypeid,
+    ))
+    db.session.commit()
+
+
+def test_returns_default_printer_for_pc(client, db, scene):
+    _link_default(db, scene['pc'], scene['printer_asset'], scene['dp_type'])
+
+    resp = client.get('/api/printers/pc-default?machine=3210')
+    assert resp.status_code == 200
+    data = resp.get_json()['data']
+    assert data['printerid'] == scene['printer'].printerid
+    assert data['windowsname'] == 'HP-CSF04-Materials'
+
+
+def test_pc_without_default_returns_empty(client, db, scene):
+    resp = client.get('/api/printers/pc-default?machine=3210')
+    assert resp.status_code == 200
+    assert resp.get_json()['data'] == {}
+
+
+def test_unknown_machine_returns_empty(client, db, scene):
+    resp = client.get('/api/printers/pc-default?machine=NOPE')
+    assert resp.status_code == 200
+    assert resp.get_json()['data'] == {}
+
+
+def test_missing_machine_param_returns_empty(client, db, scene):
+    resp = client.get('/api/printers/pc-default')
+    assert resp.status_code == 200
+    assert resp.get_json()['data'] == {}