feat: project skeleton with config, dependencies, and test setup

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

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

tests/test_config.py

@@ -0,0 +1,17 @@
+import os
+from mqtt_home.config import Settings
+
+
+def test_default_settings():
+    s = Settings()
+    assert s.mqtt_host == "localhost"
+    assert s.mqtt_port == 1883
+    assert s.web_port == 8000
+
+
+def test_settings_from_env(monkeypatch):
+    monkeypatch.setenv("MQTT_HOST", "192.168.1.1")
+    monkeypatch.setenv("MQTT_PORT", "1884")
+    s = Settings()
+    assert s.mqtt_host == "192.168.1.1"
+    assert s.mqtt_port == 1884