Default server to 127.0.0.1 instead of 0.0.0.0

Bind to localhost by default for security. Use WIDEMEM_HOST env var
to override when network access is needed.

Author: remete618

widemem/server.py

@@ -115,4 +115,5 @@ def health():
     import uvicorn
 
     port = int(os.environ.get("WIDEMEM_PORT", "11435"))
-    uvicorn.run("widemem.server:app", host="0.0.0.0", port=port)
+    host = os.environ.get("WIDEMEM_HOST", "127.0.0.1")
+    uvicorn.run("widemem.server:app", host=host, port=port)