fix: PROACTIVE_MSG_MIN_GAP_SEC=0 写入.env

backend/ai-core/internal/background/thinker.go

@@ -511,7 +511,7 @@ func NewThinker(
 		lightThinkEnabled:   cfg.LightThinkEnabled,
 		lightThinkInterval:  cfg.LightThinkInterval,
 		silenceTimeout:      cfg.SilenceTimeout,
-		proactiveMsgMinGap:  getEnvDuration("PROACTIVE_MSG_MIN_GAP_SEC", 60), // 默认1分钟
+		proactiveMsgMinGap:  getEnvDuration("PROACTIVE_MSG_MIN_GAP_SEC", 60),
 		postChatDelay:       cfg.PostChatDelay,
 		minThinkGap:         cfg.MinThinkGap,
 		offlineThinkGap:     cfg.OfflineThinkGap,