Add SearXNG web search for current information

- Add searxng.py service for web queries via SearXNG API
- Integrate search into ai_chat.py with AI-driven search decisions
- AI determines if query needs current info, then searches automatically
- Add SEARXNG_URL, SEARXNG_ENABLED, SEARXNG_MAX_RESULTS config options
- Update documentation in README.md, CLAUDE.md, and .env.example

src/daemon_boyfriend/services/__init__.py

@@ -3,10 +3,12 @@
 from .ai_service import AIService
 from .conversation import ConversationManager
 from .providers import AIResponse, Message
+from .searxng import SearXNGService
 
 __all__ = [
     "AIService",
     "AIResponse",
     "Message",
     "ConversationManager",
+    "SearXNGService",
 ]