feat: add L/S ratio collector service for top_acct and global ratios

Collect top trader account L/S ratio and global L/S ratio every 15 minutes
for XRP, BTC, ETH (6 API calls/cycle) and persist to per-symbol parquet files.
Deployed as a separate Docker service reusing the bot image.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -52,5 +52,21 @@ services:
         max-size: "10m"
         max-file: "3"
 
+  ls-ratio-collector:
+    image: git.gihyeon.com/gihyeon/cointrader:latest
+    container_name: ls-ratio-collector
+    restart: unless-stopped
+    environment:
+      - TZ=Asia/Seoul
+      - PYTHONUNBUFFERED=1
+    volumes:
+      - ./data:/app/data
+    entrypoint: ["sh", "scripts/collect_ls_ratio_loop.sh"]
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "5m"
+        max-file: "3"
+
 volumes:
   dashboard-data: