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_gen2_config_rpc.py

@@ -0,0 +1,31 @@
+"""Gen2 config RPC mapping (no device)."""
+
+from __future__ import annotations
+
+from shelly_manager.api.gen2_config_rpc import (
+    iter_changed_top_level_keys,
+    set_config_method_and_params,
+)
+
+
+def test_set_config_switch_indexed() -> None:
+    m, p = set_config_method_and_params("switch:0", {"name": "R1"})
+    assert m == "Switch.SetConfig"
+    assert p == {"id": 0, "config": {"name": "R1"}}
+
+
+def test_set_config_sys_singleton() -> None:
+    m, p = set_config_method_and_params("sys", {"device": {"name": "x"}})
+    assert m == "Sys.SetConfig"
+    assert p == {"config": {"device": {"name": "x"}}}
+
+
+def test_set_config_wifi() -> None:
+    m, p = set_config_method_and_params("wifi", {"sta": {"ssid": "a"}})
+    assert m == "WiFi.SetConfig"
+
+
+def test_iter_changed_top_level_keys() -> None:
+    old = {"sys": {"a": 1}, "wifi": {"x": 1}}
+    new = {"sys": {"a": 1}, "wifi": {"x": 2}}
+    assert iter_changed_top_level_keys(old, new) == ["wifi"]