This update modernizes several mail-related components and related modules by removing outdated compatibility code and aligning older internal APIs with newer standards. It should improve maintainability and reduce the risk of errors in communication, recruitment, expenses, lunch, payment, and website mail workflows without introducing major user-facing changes.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:
## 

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The Sales module has been reorganized and migrated to Odoo's newer application structure, covering models, views, reports, demo data, and configuration screens. This primarily improves maintainability and consistency for future enhancements, with limited direct day-to-day impact for business users.

Task: https://www.odoo.com/web?#id=24266&view_type=form&model=project.task&action=333&active_id=248&menu_id=4720

This pull request reorganizes and updates the Sales module internals to follow Odoo's newer development structure. It should make the module easier to maintain and evolve, with little direct change expected for day-to-day business users.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:
## 

I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

This update reorganizes and modernizes the CRM VoIP module code without introducing major visible workflow changes. It helps keep call-related CRM features easier to maintain, more consistent with current platform standards, and ready for future improvements.

Task: https://www.odoo.com/web#id=27270&view_type=form&model=project.task&action=333&active_id=248&menu_id=4720