Initial commit: Shelly Manager with Textual CLI, Streamlit UI, and comprehensive .gitignore

Shelly device management app with mDNS/subnet discovery, inventory,
configuration, and mass operations for Gen1/Gen2+ devices.

Includes .gitignore excluding runtime data (device DB, user config),
AI conversation history, build artifacts, and common Python/OS patterns.

tests/test_discovery_cidr.py

@@ -0,0 +1,29 @@
+"""CIDR host listing for subnet discovery (incl. /32 fix)."""
+
+from __future__ import annotations
+
+import ipaddress
+
+from shelly_manager.core.discovery import (
+    cidr_probe_host_list,
+    hosts_for_ip_network,
+)
+
+
+def test_hosts_for_ip_network_slash_32_includes_address() -> None:
+    net = ipaddress.ip_network("192.168.23.120/32", strict=False)
+    assert net.num_addresses == 1
+    assert hosts_for_ip_network(net) == ["192.168.23.120"]
+
+
+def test_cidr_probe_host_list_slash_24() -> None:
+    hosts, ok = cidr_probe_host_list("192.168.23.0/24")
+    assert ok
+    assert "192.168.23.120" in hosts
+    assert "192.168.23.1" in hosts
+
+
+def test_cidr_probe_host_list_invalid() -> None:
+    hosts, ok = cidr_probe_host_list("not-a-cidr")
+    assert not ok
+    assert hosts == []