Add module level docstrings.

src/openflexure_microscope_server/server/legacy_api.py

@@ -1,3 +1,5 @@
+"""Provide endpoints that mimic the v2 API for OpenFlexure Connect discoverability."""
+
 import labthings_fastapi as lt
 from fastapi import Response
 from socket import gethostname

src/openflexure_microscope_server/server/serve_static_files.py

@@ -1,3 +1,5 @@
+"""Add endpoints for static files to the underlying FastAPI server."""
+
 import os
 from typing import Optional