Introduce FastTools: pre-flight classifier + context enrichment

New fast_tools.py module:
- FastTool base class (matches + run interface)
- RealTimeSearchTool: SearXNG search for weather/news/prices/scores
- FastToolRunner: classifier that checks all tools, runs matching
  ones concurrently and returns combined context

Router accepts FastToolRunner; any_matches() forces medium tier
before LLM classification (replaces _MEDIUM_FORCE_PATTERNS regex).

agent.py: _REALTIME_RE and _searxng_search_async removed; pre-flight
gather now includes fast_tool_runner.run_matching() alongside URL
fetch and memory retrieval.

To add a new fast tool: subclass FastTool, add to the list in agent.py.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -5,6 +5,6 @@ WORKDIR /app
 RUN pip install --no-cache-dir deepagents langchain-openai langgraph \
     fastapi uvicorn langchain-mcp-adapters langchain-community httpx
 
-COPY agent.py channels.py vram_manager.py router.py agent_factory.py hello_world.py .
+COPY agent.py channels.py vram_manager.py router.py agent_factory.py fast_tools.py hello_world.py .
 
 CMD ["uvicorn", "agent:app", "--host", "0.0.0.0", "--port", "8000"]