Add Docker setup with AI ensemble integration and execution loop

Dockerize the order executor with python:3.11-slim, add docker-compose
with config volume mount for hot-reload of system.yaml settings. Integrate
AI ensemble validation into order execution pipeline and add configurable
interval loop (default 60s) to replace container restart cycling.

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

.dockerignore

@@ -0,0 +1,11 @@
+.git/
+__pycache__/
+*.pyc
+.env
+logs/
+models/
+.claude/
+venv/
+data/
+fx-quant/
+*.pdf