Silence Flask access logs and retain PM2 logs for 3 days.

Stop werkzeug request spam into PM2 error files, truncate oversized logs, and install daily logrotate with 3-day retention.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/flask_access_log_lib.py

@@ -0,0 +1,16 @@
+"""关闭 Flask/Werkzeug 开发服务器 access log 刷屏(避免灌满 PM2 error 日志)."""
+from __future__ import annotations
+
+import logging
+
+
+def silence_werkzeug_access_log() -> None:
+    """仅抑制 request access 行;WARNING/ERROR 仍可读."""
+    log = logging.getLogger("werkzeug")
+    log.setLevel(logging.WARNING)
+    # 部分环境会挂 StreamHandler 到 stderr;抬高阈值即可
+    for h in list(log.handlers):
+        try:
+            h.setLevel(logging.WARNING)
+        except Exception:
+            pass