test: each app keeps its tests in a tests package

131 test modules sat next to the code they test; instances alone had
51 of them beside views.py and utils.py. They move into a
tests/ package per app, and the JavaScript checks into
webvirtcloud/tests/js. Each non-empty tests.py becomes tests/test_views.py;
the empty generated stubs are removed.

Imports of the app's own modules become absolute, paths built from
__file__ go one level up, the live helper is instances.tests.livetest,
and coverage omits */tests/*. The suite discovers the same 960 tests as
before.

webvirtcloud/tests/test_logging.py

@@ -0,0 +1,40 @@
+"""The app log is bounded (rotates) and written to a deterministic absolute
+path, not the process working directory."""
+
+import os
+
+from django.conf import settings
+from django.test import TestCase
+
+
+class LoggingConfigTestCase(TestCase):
+    def test_default_handler_rotates(self):
+        handler = settings.LOGGING["handlers"]["default"]
+        self.assertEqual(handler["class"], "logging.handlers.RotatingFileHandler")
+        self.assertGreater(handler["maxBytes"], 0)
+        self.assertGreater(handler["backupCount"], 0)
+
+    def test_log_path_is_absolute_and_not_cwd(self):
+        handler = settings.LOGGING["handlers"]["default"]
+        self.assertTrue(os.path.isabs(handler["filename"]), handler["filename"])
+
+    def test_missing_log_directory_is_created_on_settings_import(self):
+        # A clean checkout / CI / Docker build may not have the log's parent dir;
+        # importing settings (logging config) must create it, not crash.
+        import subprocess
+        import sys
+        import tempfile
+
+        tmp = tempfile.mkdtemp()
+        log = os.path.join(tmp, "nested", "wvc.log")
+        env = {
+            **os.environ,
+            "WEBVIRTCLOUD_LOG_FILE": log,
+            "DJANGO_SETTINGS_MODULE": "webvirtcloud.settings",
+        }
+        result = subprocess.run(
+            [sys.executable, "-c", "import django; django.setup()"],
+            env=env, capture_output=True, text=True,
+        )
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertTrue(os.path.isdir(os.path.dirname(log)), log)