feat: add settings and async db engine

backend/tests/conftest.py

@@ -0,0 +1,8 @@
+import os
+
+
+def pytest_configure(config):
+    """Set up minimal environment variables for tests before any imports."""
+    os.environ.setdefault("DATABASE_URL", "postgresql+asyncpg://test:test@localhost/test")
+    os.environ.setdefault("OLLAMA_BASE_URL", "http://localhost:11434")
+    os.environ.setdefault("SESSION_SECRET", "test-secret-key")

backend/tests/test_config.py

@@ -0,0 +1,11 @@
+from app.config import Settings
+
+
+def test_settings_load_from_env(monkeypatch):
+    monkeypatch.setenv("DATABASE_URL", "postgresql+asyncpg://u:p@host/db")
+    monkeypatch.setenv("OLLAMA_BASE_URL", "http://10.30.20.107:11434")
+    monkeypatch.setenv("SESSION_SECRET", "test-secret")
+    settings = Settings(_env_file=None)
+    assert settings.database_url == "postgresql+asyncpg://u:p@host/db"
+    assert settings.ollama_base_url == "http://10.30.20.107:11434"
+    assert settings.port == 7777