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_storage.py

@@ -0,0 +1,54 @@
+"""Storage backend tests."""
+
+from __future__ import annotations
+
+import pytest
+
+from datetime import UTC, datetime
+
+from shelly_manager.core.models import DeviceFilter, ShellyDevice
+from shelly_manager.storage.markdown_backend import MarkdownStorage
+from shelly_manager.storage.sqlite_backend import SqliteStorage
+
+
+def _sample_device() -> ShellyDevice:
+    return ShellyDevice(
+        id="AABBCCDDEEFF",
+        name="Test",
+        mac="AA:BB:CC:DD:EE:FF",
+        ip="10.0.0.1",
+        generation=2,
+        model="Plus1",
+        firmware="1.2.3",
+        online=True,
+        last_seen=datetime.now(UTC),
+        capabilities=["switch"],
+        status={"a": 1},
+        settings={"b": 2},
+        tags=["x"],
+    )
+
+
+@pytest.mark.asyncio
+async def test_sqlite_roundtrip(app_config_sqlite) -> None:
+    s = SqliteStorage(app_config_sqlite.sqlite_path)
+    d = _sample_device()
+    await s.save_device(d)
+    loaded = await s.get_device(d.id)
+    assert loaded is not None
+    assert loaded.ip == d.ip
+    assert loaded.settings == d.settings
+    lst = await s.list_devices(DeviceFilter(generations=[2]))
+    assert len(lst) == 1
+
+
+@pytest.mark.asyncio
+async def test_markdown_roundtrip(app_config_markdown) -> None:
+    s = MarkdownStorage(app_config_markdown.markdown_dir)
+    d = _sample_device()
+    await s.save_device(d)
+    loaded = await s.get_device(d.id)
+    assert loaded is not None
+    assert loaded.model == d.model
+    lst = await s.list_devices(None)
+    assert len(lst) == 1