feat: add Octolens keyword-mapping DAL (CM-1834)

[themarolt]

Summary

Data access for Octolens ingestion: DAL functions over the octolensKeywordMappings table
added in CM-1833. Second half of the original CM-1834 unit — the platform enums and mention
activity type shipped already in #4889.

Changes

• services/libs/data-access-layer/src/octolens/: findOctolensKeywordMapping,
  listOctolensKeywordMappings, addOctolensKeywordMapping, removeOctolensKeywordMapping
• Barrel-exported from the package's index.ts
• Colocated index.test.ts covering find/list/add/remove, including the
  (integrationId, keywordId) unique-constraint conflict

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Performance improvement
• Chore / dependency update
• Documentation

JIRA ticket

https://linuxfoundation.atlassian.net/browse/CM-1834

[cursor]

PR Summary

Low Risk
New, read/write-isolated DAL with tests; no changes to auth or existing integration flows beyond exporting new APIs.

Overview
Adds a new Octolens data-access module so ingestion can persist which Octolens keywords map to which segments per integration.

The module exposes find, list, add, and remove helpers against integration."octolensKeywordMappings", keyed by integrationId and Octolens keywordId, with list results ordered by keyword. The package barrel re-exports ./octolens. Colocated Vitest coverage exercises happy paths, integration-scoped listing, duplicate (integrationId, keywordId) rejection, and idempotent delete when nothing matches.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The DAL matches the table constraints, uses established query patterns, and has adequate integration coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Adds the Octolens keyword-mapping DAL with tested CRUD operations and package exports.

Changes:

• Adds find, list, add, and remove functions.
• Covers CRUD behavior and unique-constraint conflicts.
• Exports the Octolens DAL publicly.

File	Description
src/​octolens/​index.ts	Implements keyword-mapping queries.
src/​octolens/​index.test.ts	Tests query behavior and constraints.
src/​index.ts	Exports the Octolens module.

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[gaspergrom]

LGTM. Column names and types in the queries match the CM-1833 migration, and the (integrationId, keywordId) unique constraint backs both the find lookup and the duplicate-insert test. Tests cover find, list, add, remove, and the conflict case.