Add printer installer endpoint (data + floor-map positions)

Shopfloor 2.0 PCs can't run unsigned .bat printer maps, so the signed printer
installer EXE pulls printer data + floor-map positions from the API and renders
the picker itself. Adds the endpoint the EXE consumes.

GET /api/printers/install-list - flat, unpaginated list of NETWORK printers
(USB-only excluded), each with: printerid, name, machinenumber, windowsname,
sharename, hostname, ipaddress, vendorname, modelnumber, installpath, iscsf,
locationname, mapx, mapy. Replaces the classic apiprinters.asp contract and
adds the map position (mapx/mapy) the EXE needs.

Tests: network printer appears with map position + installer fields; USB-only
printer excluded. 188 tests pass, naming green.

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

tests/test_plugins/test_printer_install_list.py

@@ -0,0 +1,48 @@
+"""Tests for the printer installer endpoint (/api/printers/install-list).
+
+The signed printer installer EXE pulls network-printer data + floor-map
+positions from here (shopfloor 2.0 cannot run unsigned .bat maps).
+"""
+
+import pytest
+
+
+@pytest.fixture
+def printer_assettype(db):
+    from shopdb.core.models import AssetType
+    at = AssetType(assettype='printer', pluginname='printers',
+                   tablename='printers', description='Printers')
+    db.session.add(at)
+    db.session.commit()
+    return at
+
+
+def test_install_list_returns_network_printer_with_map(client, db, auth_headers,
+                                                       printer_assettype):
+    """A network printer appears with flat installer fields incl map position."""
+    created = client.post('/api/printers', json={
+        'assetnumber': 'CSF01-Materials-HP',
+        'hostname': 'wjprn01',
+        'installpath': r'\\srv\drivers\hp',
+        'mapx': 120, 'mapy': 240,
+    }, headers=auth_headers)
+    assert created.status_code == 201, created.get_json()
+
+    resp = client.get('/api/printers/install-list', headers=auth_headers)
+    assert resp.status_code == 200
+    rows = resp.get_json()['data']
+    row = next((r for r in rows if r['machinenumber'] == 'CSF01-Materials-HP'), None)
+    assert row is not None
+    assert row['hostname'] == 'wjprn01'
+    assert row['installpath'] == r'\\srv\drivers\hp'
+    assert row['mapx'] == 120 and row['mapy'] == 240
+
+
+def test_install_list_excludes_usb_only_printer(client, db, auth_headers,
+                                                printer_assettype):
+    """A printer with no hostname and no network IP is excluded."""
+    client.post('/api/printers', json={'assetnumber': 'USB-LABELER'},
+                headers=auth_headers)
+    resp = client.get('/api/printers/install-list', headers=auth_headers)
+    machinenumbers = [r['machinenumber'] for r in resp.get_json()['data']]
+    assert 'USB-LABELER' not in machinenumbers