The repair app has been reorganized to better support businesses operating with multiple companies in the same Odoo database. This helps keep repair orders, numbering, access rules, demo data, and traceability aligned with the correct company, reducing confusion for users working across entities.

task-2081645

The mail message code has been reorganized to make it easier for developers to understand and maintain. This is an internal cleanup only, with no expected change to how users experience the mail features.

Purpose of this commit is to reorganize mail.message file in order to
better understand its content. It is done according to guidelines

  * computed fields;
  * CRUD and search / check access overrides;
  * actions (discuss, moderation, fetch / failure);
  * tools;