chore: implemented patch HTTP method for member project affiliations (CM-1041)

[themarolt]

Note

Medium Risk
Adds a new write API that deletes and reinserts per-project member affiliations and triggers downstream recalculation, so incorrect inputs or query assumptions could impact affiliation data. Also changes the segment selection filter in fetchMemberProjectSegments, which may alter which projects appear in responses.

Overview
Adds PATCH /:memberId/project-affiliations/:projectId to replace a member’s manual affiliations for a specific project, with request validation, audit-log capture, transactional delete+insert, and a follow-up affiliation recalculation trigger.

Refactors affiliation response mapping into shared mappers.ts, and extends the data-access layer with project-scoped affiliation fetch/delete/insert helpers plus an optional segmentId filter for fetchMemberProjectSegments (including an updated grandparentSlug filter).

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[Copilot]

Pull request overview

Adds a new public API endpoint to partially update a member’s per-project (segment) affiliation, including DAL helpers for fetching/updating the underlying memberSegmentAffiliations rows and making organization fields nullable.

Changes:

• Made organizationId / organizationName nullable in ISegmentAffiliationWithOrg.
• Added DAL helpers to fetch a single member+project affiliation and partially update it.
• Added PATCH /:memberId/project-affiliations/:projectId public API route + handler.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
services/libs/data-access-layer/src/members/projectAffiliations.ts	Adds single-affiliation fetch + partial update helpers; adjusts affiliation-with-org typing for null orgs.
backend/src/api/public/v1/members/project-affiliations/patchProjectAffiliation.ts	New PATCH handler to update project affiliation fields and trigger affiliation recalculation.
backend/src/api/public/v1/members/index.ts	Wires the new PATCH route into the public v1 members router.

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