feat(headless): add fastapi and uvicorn dependencies

tests/test_headless_dependencies.py

@@ -0,0 +1,16 @@
+import pytest
+import importlib
+
+def test_fastapi_installed():
+    """Verify that fastapi is installed."""
+    try:
+        importlib.import_module("fastapi")
+    except ImportError:
+        pytest.fail("fastapi is not installed")
+
+def test_uvicorn_installed():
+    """Verify that uvicorn is installed."""
+    try:
+        importlib.import_module("uvicorn")
+    except ImportError:
+        pytest.fail("uvicorn is not installed")