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>

tests/test_flask_access_log_lib.py

@@ -0,0 +1,17 @@
+"""silence_werkzeug_access_log 烟雾测试."""
+import logging
+import unittest
+
+from lib.common.flask_access_log_lib import silence_werkzeug_access_log
+
+
+class TestSilenceAccessLog(unittest.TestCase):
+    def test_sets_warning_level(self):
+        log = logging.getLogger("werkzeug")
+        log.setLevel(logging.INFO)
+        silence_werkzeug_access_log()
+        self.assertGreaterEqual(log.level, logging.WARNING)
+
+
+if __name__ == "__main__":
+    unittest.main()