feat: add query layer (CM-1059)

[ulemons]

DevStats Affiliations API + Generic DAL resolver

Implements the /v1/dev-stats/affiliations endpoint that allows external tools (e.g. DevStats/gitdm) to resolve GitHub contributor affiliations in bulk.

API

POST /v1/dev-stats/affiliations
Authorization: Bearer <api-key>

{ "githubHandles": ["handle1", "handle2"] }

Accepts up to 1,000 handles per request. Returns resolved, non-overlapping affiliation periods per contributor, sorted by most recent first.

Implementation

services/libs/data-access-layer/src/affiliations/ — new generic module, usable by any consumer:

• IAffiliationPeriod — public type representing a single affiliation window
• resolveAffiliationsByMemberIds — bulk resolver for up to N members in 2 DB queries
• findWorkExperiencesBulk / findManualAffiliationsBulk — exported separately for reuse
• Conflict resolution mirrors prepareMemberOrganizationAffiliationTimeline but uses an interval-based approach (boundary dates) instead of day-by-day iteration, making it viable for bulk requests

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[github-actions]

Conventional Commits FTW!