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_json_path.py

@@ -0,0 +1,29 @@
+"""json_path helper tests."""
+
+from __future__ import annotations
+
+from shelly_manager.core.json_path import get_json_path, is_missing
+
+
+def test_get_json_path_nested() -> None:
+    d = {"ble": {"enable": True, "rpc": {"enable": False}}}
+    assert get_json_path(d, "ble.enable") is True
+    assert get_json_path(d, "ble.rpc.enable") is False
+
+
+def test_get_json_path_missing() -> None:
+    assert is_missing(get_json_path({}, "ble.enable"))
+
+
+def test_get_json_path_empty() -> None:
+    assert is_missing(get_json_path(None, "a"))  # type: ignore[arg-type]
+
+
+def test_get_json_path_pipe_segment() -> None:
+    d = {"switch:0": {"output": True}}
+    assert get_json_path(d, "switch:0|output") is True
+
+
+def test_get_json_path_list_index() -> None:
+    d = {"relays": [{"ison": True}]}
+    assert get_json_path(d, "relays.0.ison") is True