This update streamlines how key performance indicators (KPIs) are calculated within Odoo. By using SQL directly to generate summaries, the system now responds faster and more efficiently. This change allows the /kpi/summary controller to directly access these calculations, eliminating the need for a separate registry and improving overall reporting speed.

Refactor KPI providers to compute summaries directly in SQL. This makes KPI computation callable from the /kpi/summary controller, which can call them without loading a registry.

Task-id: [5167731](https://www.odoo.com/odoo/project.task/5167731)