Fix: use auto_update.py instead of inline Python in batch

auto_update.py

@@ -0,0 +1,23 @@
+import subprocess, threading, time, sys, os
+from pathlib import Path
+
+root = Path(__file__).parent.resolve()
+
+def pull_loop():
+    while True:
+        time.sleep(60)
+        try:
+            r = subprocess.run(['git', 'pull'], cwd=root, capture_output=True, text=True, timeout=30)
+            if r.stdout.strip():
+                print(f"[auto] git pull: {r.stdout.strip()}")
+            subprocess.run([sys.executable, '-m', 'pip', 'install', '-q', '-r', 'requirements.txt'],
+                         cwd=root, capture_output=True, timeout=30)
+        except Exception as e:
+            print(f"[auto] pull error: {e}")
+
+threading.Thread(target=pull_loop, daemon=True).start()
+os.chdir(root)
+sys.path.insert(0, str(root))
+
+import uvicorn, main
+uvicorn.run('main:app', host='0.0.0.0', port=8080, reload=True)