[6788][ADD] maintenance_equipment_usability

[smorita7749]

Add maintenance_equipment_usability.

Computes equipment usability from the equipment status, the latest completed maintenance request result, and a configurable usability grace period.

• Equipment status (Preparing / Operating / Idle / Retired / Scrapped): only equipment in the Operating status can be usable.
• Maintenance result (Passed / Failed) on maintenance requests, with follow-up request creation for failed results.
• Usability (Unknown / Usable / Unusable) computed on the equipment (not stored; searchable), with badges and filters on the equipment list/kanban/search.
• Usability grace period configured per company in Settings > Maintenance (default 12 months).

[smorita7749]

Pushed 5d54443 to 6788-add-maintenance_equipment_usability.

 .../views/maintenance_equipment_views.xml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

usability_state and status are now inserted before category_id instead of after it, and in that order, so the equipment form starts with Usability, Status, Category. The customer asked for that order, and inserting before category_id also keeps it stable against #9, which inserts its own fields after category_id.

maintenance_exempt stays where it was, in a separate operation after category_id. #9 moves it into its Inspection page and relabels it Inspection Exempt (点検対象外); with this module installed alone it keeps its current place and its Maintenance Not Required label.

[AungKoKoLin1997]

Suggested change

readonly=True,

[AungKoKoLin1997]

Suggested change

readonly=True,

[AungKoKoLin1997]

Suggested change

readonly=True,