itdove/devaiflow#351: Fix confusing instructions in ticket creation session prompts

[itdove]

Description

This PR refactors the issue creation prompts in the DevAIFlow CLI to clarify backend type instructions. The changes improve user experience by making the prompts in git new and jira new commands less confusing when creating tickets.

The refactoring focuses on clarifying the backend type selection process during ticket creation sessions, making it more intuitive for users to understand which backend they're working with.

Assisted-by: Claude

Testing

Steps to test

1. Pull down the PR
2. Run devflow git new command and verify the prompts clearly indicate the backend type
3. Run devflow jira new command and verify the prompts clearly indicate the backend type
4. Verify that the instructions during the ticket creation flow are clear and unambiguous
5. Create a test issue using both commands to ensure functionality remains intact

Scenarios tested

• Verified prompt clarity when creating new Git issues
• Verified prompt clarity when creating new JIRA issues
• Confirmed no functional regression in the issue creation workflow

Deployment considerations

• This code change is ready for deployment on its own