docs: add DOCKER_GUIDE.md and fix .env parsing; chore: update docker and script configurations

scripts/run_test.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Run performance test inside Docker container
+# Usage: ./run_test.sh [days] [interval]
+
+DAYS=${1:-7}
+INTERVAL=${2:-1m}
+
+echo "Running MA44 performance test: ${DAYS} days of ${INTERVAL} data"
+echo "=================================================="
+
+docker exec btc_collector python scripts/test_ma44_performance.py --days $DAYS --interval $INTERVAL