Add housekeeping API for Home Assistant integration

Introduces home automation endpoints for the Tatlock Housekeeper agent:
- Device discovery and control (turn_on, turn_off, toggle, set_brightness)
- Scene activation and script execution
- Automation management (enable/disable)
- State history queries and area discovery

Includes Home Assistant REST client and configuration.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/config.py

@@ -26,7 +26,8 @@ try:
         PORTAINER_URL, PORTAINER_API_KEY,
         NPM_URL, NPM_EMAIL, NPM_PASSWORD,
         BRAVE_SEARCH_API_KEY,
-        GOOGLE_SEARCH_API_KEY, GOOGLE_SEARCH_ENGINE_ID
+        GOOGLE_SEARCH_API_KEY, GOOGLE_SEARCH_ENGINE_ID,
+        HOMEASSISTANT_URL, HOMEASSISTANT_TOKEN
     )
 except ImportError:
     # Fallback to empty strings if credentials.py doesn't exist
@@ -39,6 +40,8 @@ except ImportError:
     BRAVE_SEARCH_API_KEY = ""
     GOOGLE_SEARCH_API_KEY = ""
     GOOGLE_SEARCH_ENGINE_ID = ""
+    HOMEASSISTANT_URL = "http://localhost:8123"
+    HOMEASSISTANT_TOKEN = ""
 
 
 class Settings(BaseSettings):
@@ -122,6 +125,11 @@ class Settings(BaseSettings):
     npm_email: str = NPM_EMAIL
     npm_password: str = NPM_PASSWORD
 
+    # Home Assistant Configuration
+    homeassistant_url: str = HOMEASSISTANT_URL
+    homeassistant_token: str = HOMEASSISTANT_TOKEN
+    homeassistant_timeout: int = 30
+
     # Core-AI Service (AI performance metrics)
     core_ai_base_url: str = "http://core-ai:8086"