fix: add operation log for password change

- ChangePassword handler now records 'change_password' action in operation_logs
- Logs include username, source IP, and timestamp for audit purposes

server/handlers/auth.go

@@ -84,6 +84,11 @@ func (h *AuthHandler) ChangePassword(c *gin.Context) {
 	}
 
 	h.Cfg.AdminPass = string(hashed)
+
+	// 记录密码修改日志
+	var entityID int64 = 0
+	middleware.LogOperation("change_password", "user", &entityID, h.Cfg.AdminUser, "", "", c.ClientIP(), h.Cfg.AdminUser)
+
 	c.JSON(http.StatusOK, gin.H{"message": "密码修改成功"})
 }