test(09-03): add failing .ps1 route and detail-page link tests

- Create tests/test_script_download.py with 5 tests for .ps1 routes (install/uninstall/detect, 404, 422)
- Add test_detail_page_shows_script_links to TestCommandPreview in tests/test_packages.py
- All 6 new tests go RED (routes and template links do not exist yet)

tests/test_packages.py

@@ -190,6 +190,16 @@ class TestCommandPreview:
         assert f"/printers/{printer.id}/icon" in html
         assert "icon-status" in html
 
+    def test_detail_page_shows_script_links(self, client, setup_printer_with_driver):
+        """Printer detail page shows 3 direct .ps1 script download links when driver assigned."""
+        printer, _ = setup_printer_with_driver
+        resp = client.get(f"/printers/{printer.id}")
+        assert resp.status_code == 200
+        html = resp.text
+        assert f"/printers/{printer.id}/scripts/install.ps1" in html
+        assert f"/printers/{printer.id}/scripts/uninstall.ps1" in html
+        assert f"/printers/{printer.id}/scripts/detect.ps1" in html
+
 
 # ---------------------------------------------------------------------------
 # Icon inclusion in .intunewin export