feat: CLI commands for device management, broker monitoring, and serve

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_cli.py

@@ -0,0 +1,27 @@
+import pytest
+from click.testing import CliRunner
+from mqtt_home.cli import cli
+
+
+def test_device_list_empty(monkeypatch):
+    runner = CliRunner()
+
+    async def mock_init():
+        pass
+
+    async def mock_list(db):
+        return []
+
+    monkeypatch.setattr("mqtt_home.cli.init_db", mock_init)
+    monkeypatch.setattr("mqtt_home.cli.list_devices", mock_list)
+
+    result = runner.invoke(cli, ["device", "list"])
+    assert result.exit_code == 0
+    assert "暂无设备" in result.output
+
+
+def test_cli_groups():
+    runner = CliRunner()
+    result = runner.invoke(cli, ["--help"])
+    assert "device" in result.output
+    assert "broker" in result.output