feat(storage): add Evernote destination (#862)

* feat(storage): add Evernote destination

* style: apply ruff auto-fix

- Auto-formatted code with ruff format
- Applied ruff linting fixes with --fix

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

---------

Co-authored-by: Christian Krakau-Louis <christian@Christians-Mac-mini-7.local>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

tests/test_config_validators.py

@@ -35,6 +35,7 @@ class TestValidateStorageConfigs:
             "google_drive",
             "onedrive",
             "email",
+            "evernote",
             "paperless",
             "uptime_kuma",
         ]
@@ -83,6 +84,13 @@ class TestValidateStorageConfigs:
             assert "DEST_EMAIL_HOST is not configured" in result["email"]
             assert "DEST_EMAIL_DEFAULT_RECIPIENT is not configured" in result["email"]
 
+    def test_evernote_missing_token(self):
+        """Test validation when Evernote destination auth token is missing."""
+        with patch("app.utils.config_validator.validators.settings") as mock_settings:
+            mock_settings.evernote_auth_token = None
+            result = validate_storage_configs()
+            assert "EVERNOTE_AUTH_TOKEN is not configured" in result["evernote"]
+
 
 @pytest.mark.unit
 class TestValidateEmailConfig: