Prompt for password when --user provided without --pass

[Copilot]

When --user is specified without --pass, the script attempts passwordless authentication and exits on failure. This prevents interactive password entry for users who want to avoid exposing credentials in command history.

Changes

• Add password prompt when --user is provided, --pass is not, and initial connection fails
• Prompt only occurs if --noask flag is not set (preserves automation behavior)
• Use stty -echo for secure password input, matching existing prompt implementation
• Consolidate duplicate error handling

Example

Before:

$ perl mysqltuner.pl --user dbadmin
[!!] Attempted to use login credentials, but they were invalid
$ _

After:

$ perl mysqltuner.pl --user dbadmin
Please enter your MySQL administrative password: ********
[OK] Logged in using credentials with prompted password
[--] Performing tests on localhost:3306

All existing authentication flows remain unchanged:

• --user + --pass → uses provided credentials
• --user + --noask → exits on failure without prompting
• No credentials → tries auto-detection, then prompts for both username and password

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Prompt for username and password by default</issue_title>
<issue_description>Hi,

Congratulations for this excellent product.

It would be nice if MySQLTuner-perl prompted for username and password if not specified in the parameters/arguments passed on execution.

--
Regards,
Mauro</issue_description>

<agent_instructions>read le README.md and anwser</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Prompt for username and password by default #866

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