Fix .env override priority and password whitespace stripping

Change load_dotenv() to load_dotenv(override=False) so real environment
variables always take priority over stale .env files. This prevents a
hardcoded or outdated REDMINE_API_KEY in .env from silently overriding
a fresh token exported in the shell (#15).

Add .strip() to get_redmine_password() for consistency with all other
config getters — trailing whitespace in .env no longer causes silent
auth failures (#35).

Closes #15, closes #35

tests/test_config.py

@@ -99,3 +99,27 @@ def test_get_redmine_verify_true_values(value):
 @mock.patch.dict(os.environ, {"REDMINE_VERIFY": "/tmp/redmine-ca.pem"}, clear=True)
 def test_get_redmine_verify_custom_path():
     assert Config.get_redmine_verify() == "/tmp/redmine-ca.pem"
+
+
+# -- #15: .env не должен переопределять переменные окружения --
+
+
+@mock.patch("dotenv.load_dotenv")
+def test_env_var_takes_priority_over_dotenv(mock_load):
+    """load_dotenv вызывается с override=False — env vars не перебиваются .env."""
+    import importlib
+
+    from redmine_reporter import config as cfg_mod
+
+    importlib.reload(cfg_mod)
+
+    mock_load.assert_called_once_with(override=False)
+
+
+# -- #35: get_redmine_password должен делать .strip() --
+
+
+@mock.patch.dict(os.environ, {"REDMINE_PASSWORD": "  secret123  "}, clear=True)
+def test_get_redmine_password_strips_whitespace():
+    """Пароль обрезается от whitespace, как и все остальные геттеры."""
+    assert Config.get_redmine_password() == "secret123"