The documented RabbitMQ credential encryption feature using Jasypt is non-functional on CloudStack 4.22.x

### problem

If we follow the documented RabbitMQ credential encryption feature, literally copy paste the configuration from https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/events.html , the encrypted credentials are not being decrypted and RabbitMQ connection is not established. Instead the error messages are thrown to the management server log about missing classes.

Upon further analysis it seems the jasypt library is incompatible with Spring 5+. There is a https://github.com/jasypt/jasypt/issues/25 and/or https://github.com/jasypt/jasypt/issues/35 . And so this is most probably the root cause as the class fails to load on Spring 5 which CloudStack is using.

### versions

CloudStack 4.22.1.0 and also 4.22.0.1, Standard management server install, Ubuntu

### The steps to reproduce the bug

STEPS TO REPRODUCE
1. Follow the AMQP configuration documentation at https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/events.html
2. Add the documented Jasypt bean configuration to spring-event-bus-context.xml
3. Restart cloudstack-management

EXPECTED BEHAVIOUR:
Encrypted credentials are decrypted and RabbitMQ connection is established.

ACTUAL BEHAVIOUR:
```
Error creating bean with name 'org.apache.cloudstack.spring.lifecycle.ConfigDepotLifeCycle#0': Unsatisfied dependency expressed through field 'configDepotAdmin'; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.jasypt.spring3.properties.EncryptablePropertyPlaceholderConfigurer] for bean with name 'propertyConfigurer' defined in file [/etc/cloudstack/management/META-INF/cloudstack/event/spring-event-bus-context.xml]; nested exception is java.lang.ClassNotFoundException: org.jasypt.spring3.properties.EncryptablePropertyPlaceholderConfigurer
/var/log/cloudstack/management/management-server.log.2026-06-03.gz:Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.jasypt.spring3.properties.EncryptablePropertyPlaceholderConfigurer] for bean with name 'propertyConfigurer' defined in file [/etc/cloudstack/management/META-INF/cloudstack/event/spring-event-bus-context.xml]; nested exception is java.lang.ClassNotFoundException: org.jasypt.spring3.properties.EncryptablePropertyPlaceholderConfigurer
/var/log/cloudstack/management/management-server.log.2026-06-03.gz:Caused by: java.lang.ClassNotFoundException: org.jasypt.spring3.properties.EncryptablePropertyPlaceholderConfigurer
```

### What to do about it?

Replace the implementation with a Spring 5-compatible alternative
and/or document a supported workaround. Also, there is second issue with the PBEWithMD5AndDES is no longer considered secure, so the solution shall be future proof.

先檢視開啟中的 pull request #13676，以及 events.html 中記錄的 AMQP 設定。檢查 spring-event-bus-context.xml 和 management-server.log 中的例外，以追蹤缺少的 Jasypt 類別。當文件中記錄的加密 RabbitMQ 憑證能在與 Spring 5 相容的設定下運作，且已記錄安全的替代方案或受支援的 workaround 時，即表示完成。

由索引模型根據 Issue 內容生成。