fix: separate data scripts from volume mount directory

Move get_daily_price.py and merge_jsonl.py to /app/scripts
to prevent volume mount from overlaying the scripts.
Scripts run from /app/data context to output correctly.

Fixes container startup error where scripts were not found
after ./data volume mount replaced container's /app/data.

entrypoint.sh

@@ -5,9 +5,10 @@ echo "🚀 Starting AI-Trader..."
 
 # Step 1: Data preparation
 echo "📊 Fetching and merging price data..."
+# Run scripts from /app/scripts but output to /app/data
 cd /app/data
-python get_daily_price.py
-python merge_jsonl.py
+python /app/scripts/get_daily_price.py
+python /app/scripts/merge_jsonl.py
 cd /app
 
 # Step 2: Start MCP services in background