Router redis auth info handling

[t2wang]

In the file agentcube-router.yaml , user needs to specify redis address and password for the router to be functional.

Currently, there is no clear guidance on how users should be passing in these sentitive user data.

env:

• name: REDIS_ADDR
  value: "127.0.0.1:6379"
• name: REDIS_PASSWORD
  value: ""

[hzxuzhonghu]

From the security view, using env to pass passwd is not allowed. We should support using secret volume mount mechnism.

[hzxuzhonghu]

For controbutors who are familiar with k8s secret and volume mount.

[yashisrani]

/assign

[Sagar-6203620715]

Hi @yashisrani There are merge conflicts in your Pull Request can you please resolve them, the PR is almost approved as per discussion from @hzxuzhonghu.
If you want, I can work on it.