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/conftest.py

@@ -0,0 +1,42 @@
+import pytest
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from sqlalchemy.pool import StaticPool
+
+from mqtt_home.database import Base
+from mqtt_home.config import Settings
+
+TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"
+
+
+@pytest.fixture
+def settings():
+    return Settings(
+        mqtt_host="localhost",
+        mqtt_port=1883,
+        emqx_api_url="http://localhost:18083/api/v5",
+        emqx_api_key="test-key",
+        emqx_api_secret="test-secret",
+        database_url=TEST_DATABASE_URL,
+    )
+
+
+@pytest.fixture
+async def engine():
+    engine = create_async_engine(
+        TEST_DATABASE_URL,
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    yield engine
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+    await engine.dispose()
+
+
+@pytest.fixture
+async def db_session(engine):
+    async_session = async_sessionmaker(engine, expire_on_commit=False)
+    async with async_session() as session:
+        yield session

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