feat: add Android client/server quickstart

[digitallysavvy]

Summary

Adds the official Android conversational AI client/server quickstart to Agora CLI.

• Supports agora init and agora quickstart create using the upstream default branch.
• Clones the Android client and included Python server.
• Seeds server/.env.local from server/.env.example with AGORA_APP_ID and AGORA_APP_CERTIFICATE.
• Never writes Agora credentials to local.properties; the upstream configure-android script writes only the public HTTPS server URL there.
• Returns next steps for Python server setup, server startup, HTTPS tunneling, Android URL configuration, and APK assembly.
• Adds integration coverage for project creation, server env generation, example-setting preservation, and the local.properties credential boundary.

Testing

CI should run the repository Go test, formatting, lint, and security checks against the rebased branch.

Public contract

Adds android to the quickstart template catalog. Existing JSON result shapes and exit-code behavior are unchanged.

Security

The App Certificate remains server-only in server/.env.local and is not compiled into the Android client.

[anandwana001]

I think we don't need this anymore. WE had update the android repo for default branch