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_unit.py

@@ -0,0 +1,42 @@
+"""Discovery helpers: IPv6 URLs, probe port, mDNS task drain (unit-level)."""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from shelly_manager.core.urls import device_http_url, http_host_for_url
+
+
+def test_http_host_ipv4_unchanged() -> None:
+    assert http_host_for_url("192.168.1.1") == "192.168.1.1"
+
+
+def test_http_host_ipv6_brackets() -> None:
+    assert http_host_for_url("fe80::1") == "[fe80::1]"
+    assert http_host_for_url("fe80::1%en0") == "[fe80::1]"
+
+
+def test_device_http_url_default_port() -> None:
+    assert device_http_url("192.168.1.5") == "http://192.168.1.5/"
+
+
+def test_device_http_url_ipv6_and_port() -> None:
+    assert device_http_url("fe80::1", port=8080) == "http://[fe80::1]:8080/"
+
+
+@pytest.mark.asyncio
+async def test_probe_ip_passes_port_to_fetch() -> None:
+    from shelly_manager.api.client import probe_ip
+
+    with patch(
+        "shelly_manager.api.client.fetch_shelly_json",
+        new_callable=AsyncMock,
+    ) as fetch:
+        fetch.return_value = {"type": "SHSW-21", "mac": "AA"}
+        session = MagicMock()
+        out = await probe_ip(session, "10.0.0.1", port=8080)
+        fetch.assert_called_once_with(session, "10.0.0.1", port=8080, timeout_sec=3.0)
+        assert out is not None
+        assert out[0] == 1