Refactor: implemented Repository Factory and Async Mutator Engine. Decoupled storage logic and enforced Dependency Injection across CLI and Web API. Updated documentation.

tests/conftest.py

@@ -6,6 +6,15 @@ any test file imports decnet.* — pytest loads conftest.py first.
 """
 import os
 
-os.environ.setdefault("DECNET_JWT_SECRET", "test-jwt-secret-not-for-production-use")
-# Expose OpenAPI schema so schemathesis can load it during tests
-os.environ.setdefault("DECNET_DEVELOPER", "true")
+os.environ["DECNET_JWT_SECRET"] = "stable-test-secret-key-at-least-32-chars-long"
+os.environ["DECNET_ADMIN_PASSWORD"] = "test-password-123"
+os.environ["DECNET_DEVELOPER"] = "true"
+os.environ["DECNET_DB_TYPE"] = "sqlite"
+
+import pytest
+from typing import Any
+
+@pytest.fixture(autouse=True)
+def standardize_auth_secret(monkeypatch: Any) -> None:
+    import decnet.web.auth
+    monkeypatch.setattr(decnet.web.auth, "SECRET_KEY", os.environ["DECNET_JWT_SECRET"])