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>

src/mqtt_home/config.py

@@ -0,0 +1,20 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    mqtt_host: str = "localhost"
+    mqtt_port: int = 1883
+    mqtt_username: str = ""
+    mqtt_password: str = ""
+    emqx_api_url: str = "http://localhost:18083/api/v5"
+    emqx_api_key: str = ""
+    emqx_api_secret: str = ""
+    database_url: str = "sqlite+aiosqlite:///./data/mqtt_home.db"
+    web_host: str = "0.0.0.0"
+    web_port: int = 8000
+
+    model_config = {"env_file": ".env", "env_prefix": ""}
+
+
+def get_settings() -> Settings:
+    return Settings()

src/mqtt_home/database.py

@@ -0,0 +1,5 @@
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass