[Improve][Manager][Dashboard] Enforce password change on first login for default admin account

[spiritxishi]

Description

Background

The default admin/****** credentials in application.properties are well-known and can be exploited if unchanged. There is currently no mechanism to force users to change the password after the initial login.

Affected Code:
inlong-manager/.../application.properties:21-22

Proposed Fix

Implement a mandatory password-reset flow triggered on first login for the default admin account (and any account using the default password).

Acceptance Criteria

• After first login with default credentials, user is redirected to a password change page
• Core functionality is inaccessible until the password is changed
• New password must meet minimum complexity requirements
• Auditable: log when a default-password account is first changed

InLong Component

InLong Manager

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct