feat: add resource library and real image workflow

tests/test_settings.py

@@ -0,0 +1,15 @@
+"""Tests for application settings resolution."""
+
+from pathlib import Path
+
+from app.config.settings import Settings
+
+
+def test_settings_env_file_uses_backend_repo_path() -> None:
+    """Settings should resolve .env relative to the backend repo, not the launch cwd."""
+
+    env_file = Settings.model_config.get("env_file")
+
+    assert isinstance(env_file, Path)
+    assert env_file.is_absolute()
+    assert env_file.name == ".env"