chore: A股接口 timeout 10s→15s 减少超时失败

scripts/fetch_market.py

@@ -38,9 +38,9 @@ def fetch_crypto():
 
 
 def fetch_cn_indices():
-    """Fetch A-share indices via Eastmoney API (no key)."""
+    """Fetch A-share indices via Eastmoney API (no key). Retry once on timeout."""
     try:
-        resp = requests.get(EM_URL, timeout=10)
+        resp = requests.get(EM_URL, timeout=15)
         data = resp.json()
         items = []
         for diff in data.get("data", {}).get("diff", []):