The DDP commit (8f1140a) added imports of infer_http_scheme into
api/routes/devices.py but missed bringing in the module itself --
url_scheme.py and its net_classify.py dependency were in the working
tree as untracked files only. On a clean checkout the FastAPI app
fails to start with ModuleNotFoundError.
Caught by the pre-merge code review. The 1358 passing tests only
worked because the local working tree happens to have the files.
This commit adds:
- ledgrab.utils.url_scheme: infer_http_scheme() for LAN-vs-public WLED
URL scheme inference
- ledgrab.utils.net_classify: HostCategory enum + classify_ip() +
is_blocked_for_ssrf() + is_local_for_http_default() + is_loopback().
Single source of truth for IP categorisation used by safe_source
(SSRF), url_scheme (LAN), and auth (loopback exemption).
- 107 unit tests (test_url_scheme.py + test_net_classify.py).
net_classify.is_blocked_for_ssrf is the primitive the device-driver
validate_device methods will use in the next commit to close HIGH #4
from the review.
