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

scripts/health_check.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Health check script for cron/scheduler
+
+# Check if containers are running
+if ! docker ps | grep -q "btc_timescale"; then
+    echo "ERROR: TimescaleDB container not running"
+    # Send notification (if configured)
+    exit 1
+fi
+
+if ! docker ps | grep -q "btc_collector"; then
+    echo "ERROR: Data collector container not running"
+    exit 1
+fi
+
+# Check database connectivity
+docker exec btc_timescale pg_isready -U btc_bot -d btc_data > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    echo "ERROR: Cannot connect to database"
+    exit 1
+fi
+
+# Check if recent data exists
+LATEST=$(docker exec btc_timescale psql -U btc_bot -d btc_data -t -c "SELECT MAX(time) FROM candles WHERE time > NOW() - INTERVAL '5 minutes';" 2>/dev/null)
+if [ -z "$LATEST" ]; then
+    echo "WARNING: No recent data in database"
+    exit 1
+fi
+
+echo "OK: All systems operational"
+exit 0