[16.0][ADD] crm_stage_validation: add new module

[marcelsavegnago]

This module extends the CRM functionality by allowing you to validate that specific fields are filled when moving a lead/opportunity to a certain stage.

Main Features

• Field Validation per Stage: Configure which fields must be filled when a lead/opportunity reaches a specific stage
• Flexible Configuration: Select any field from the CRM lead model to be validated
• Clear Error Messages: Users receive detailed validation errors indicating which fields need to be filled
• Multi-record Support: Validation works when moving multiple leads/opportunities at once

Benefits

• Ensure data quality by requiring important fields at specific pipeline stages
• Prevent leads from advancing without crucial information
• Customize validation rules for each stage of your sales pipeline
• Improve reporting accuracy by ensuring complete data at each stage

Dependencies

This module requires:

• crm: Odoo's CRM module

[kaynnan]

LGTM

[kaynnan]

ping @WesleyOliveira98 @CristianoMafraJunior

[rrebollo]

✅ Code Review: LGTM

Thank you for your valuable contribution. The feature addresses a clear need within the validation workflow scope.

For several versions now, Odoo/OCA has maintained a robust framework for this type of requirement: tier_validation (from the OCA/server-ux repository). A module like crm_stage_tier_validation would likely be well-received by the community, as it would expand the feature beyond basic field validation into a more comprehensive approval system.

Please don't misunderstand — this is excellent work and represents a key functionality. It actually raises a broader question: why isn't this already part of the vanilla system?

If merged, this PR would certainly be a valuable addition. However, from a long-term and community-wide perspective, I believe enriching established tools like tier_validation is often more sustainable than creating new, separate solutions. This approach helps consolidate efforts and avoids fragmentation.

With that said, would you be open to reviewing my PR #661? It's also an addition, so please feel free to question or comment on any aspect of it. I welcome your perspective.

Thank you again for your work and collaboration.

[WesleyOliveira98]

CODE REVIEW - OK

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖