feat(geninventorynumber): add custom asset capacity for inventory number generation

[MyvTsv]

• 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

• Implements custom asset support for the geninventorynumber plugin via GLPI 11's capacity system. Custom assets can now be enabled/disabled for automatic inventory number generation, with automatic configuration management when the capacity is toggled.

Screenshots (if appropriate):

Capacities menu:

Plugin Config:

[stonebuzz]

@MyvTsv Can you add some test ? If it possible ?

[stonebuzz]

Could you update the logic as follows:

• onClassBootstrap → Add the configuration entry to the database if it does not exist (set active to false by default).
• onCapacityEnabled → Set active to true.
• onCapacityDisabled → Set active to false.

This approach ensures that the configuration is not lost when the feature is disabled.

Additionally, we need to handle the case when a custom asset is deleted, in order to remove its corresponding entry from the database.

This last point might be the one to investigate first, because if the capacity system cannot be notified when a custom asset is deleted, we won’t be able to modify the current logic.

[Rom1-B]

Please update CHANGELOG