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.

console/test_socketiod_disabled.py

@@ -1,42 +0,0 @@
-import os
-import subprocess
-import sys
-import tempfile
-import unittest
-from pathlib import Path
-
-ROOT = Path(__file__).resolve().parent.parent
-SOCKETIOD = ROOT / "console" / "socketiod"
-
-
-class SocketiodDisabledTestCase(unittest.TestCase):
-    """socketiod must refuse to start unless explicitly enabled."""
-
-    def test_socketiod_exits_when_serial_console_disabled(self):
-        # The settings module lives in a temporary directory, so the test does
-        # not write into the source tree (read-only checkouts, --parallel).
-        with tempfile.TemporaryDirectory() as tmp:
-            (Path(tmp) / "socketiod_disabled_settings.py").write_text(
-                "from webvirtcloud.settings import *  # noqa\n"
-                "SERIAL_CONSOLE_ENABLED = False\n"
-                "SOCKETIO_HOST = '127.0.0.1'\n"
-                "SOCKETIO_PORT = 0\n"
-            )
-            env = dict(
-                os.environ,
-                DJANGO_SETTINGS_MODULE="socketiod_disabled_settings",
-                PYTHONPATH=os.pathsep.join([tmp, str(ROOT)]),
-            )
-            try:
-                result = subprocess.run(
-                    [sys.executable, str(SOCKETIOD)],
-                    cwd=ROOT,
-                    env=env,
-                    capture_output=True,
-                    text=True,
-                    timeout=20,
-                )
-            except subprocess.TimeoutExpired:
-                self.fail("socketiod kept running although SERIAL_CONSOLE_ENABLED=False")
-        self.assertNotEqual(result.returncode, 0, result.stdout + result.stderr)
-        self.assertIn("SERIAL_CONSOLE_ENABLED", result.stderr)