Fix(install): use unsigned integers for primary and foreign key

[stonebuzz]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixesIssue Installing and Displaying the Centreon 1.0.2 Plugin on GLPI 10.0.18 #59

During plugin installation, a PHP warning could occur due to the use of an incorrect SQL field type:

[2025-09-04 12:17:30] glpiphplog.WARNING: *** PHP User Warning (512): Usage of signed integers in primary or foreign keys is discouraged, please use unsigned integers instead in`glpi_plugin_centreon_hosts`.`items_id`. in /home//DEV/GLPI/10bugfixes/src/DBmysql.php at line 2181
Backtrace :
src/DBmysql.php:2181 trigger_error()
src/DBmysql.php:386 DBmysql->checkForDeprecatedTableOptions()
plugins/centreon/hook.php:59 DBmysql->doQuery()
src/Plugin.php:955 plugin_centreon_install()
front/plugin.form.php:51 Plugin->install()
public/index.php:82 require()

The issue was caused by the use of a signed integer in a primary or foreign key, which is discouraged.

A migration script has been added to automatically update the field type.

Screenshots (if appropriate):