feat: automate merged.jsonl creation during price fetching

Streamline the data preparation workflow by having get_daily_price.py
automatically invoke merge_jsonl.py after fetching all stock prices.

Changes:
- Modified get_daily_price.py to call merge_jsonl.py automatically
- Updated entrypoint.sh to remove redundant merge_jsonl.py call
- Updated main.sh to remove redundant merge_jsonl.py call
- Fixed import order for linting compliance

Benefits:
- Single command now handles both fetching and merging
- Ensures merged.jsonl is always created after price updates
- Simplifies Docker container startup process
- Prevents missing merged.jsonl errors in production

data/get_daily_price.py

@@ -1,8 +1,12 @@
-import requests
-import os
-from dotenv import load_dotenv
-load_dotenv()
 import json
+import os
+import subprocess
+import sys
+
+import requests
+from dotenv import load_dotenv
+
+load_dotenv()
 
 
 all_nasdaq_100_symbols = [
@@ -42,4 +46,15 @@ if __name__ == "__main__":
     for symbol in all_nasdaq_100_symbols:
         get_daily_price(symbol)
 
-    get_daily_price("QQQ")
+    get_daily_price("QQQ")
+
+    # Automatically run merge after fetching
+    print("\n📦 Merging price data...")
+    try:
+        script_dir = os.path.dirname(os.path.abspath(__file__))
+        merge_script = os.path.join(script_dir, "merge_jsonl.py")
+        subprocess.run([sys.executable, merge_script], check=True)
+        print("✅ Price data merged successfully")
+    except Exception as e:
+        print(f"⚠️  Failed to merge data: {e}")
+        print("   Please run 'python merge_jsonl.py' manually")