feat(api): add GET /content/profiles endpoint (closes #146)

[bbornino]

Closes #146.

Adds GET /content/profiles?page=0&limit=10, returning a paginated list of author profiles: id (slug), name, description, profileImageUrl.

Follows the same pattern as collections.ts (TypeBox schemas, createImageUrl(), pagination via page/limit). No locale param — profiles aren't localized, unlike posts/collections. No DB schema changes needed.

Testing

• New profiles.test.ts: 3 tests (all profiles, empty list, pagination offset/limit math).
• pnpm test:unit: all 24 targets pass.
• pnpm prettier (check): clean except a pre-existing, unrelated flag on .claude/settings.local.json.

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📥 Commits

Reviewing files that changed from the base of the PR and between 5b1c106 and c9a7d39.

📒 Files selected for processing (4)

• apps/api/src/createApp.ts
• apps/api/src/routes/content/profiles.test.ts
• apps/api/src/routes/content/profiles.ts
• apps/api/test-utils/setup.ts

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[fennifith]

LGTM!

We'll need to add a bit more to this endpoint for sorting/filtering to eventually power the Join Us page and the author filters on the Search page - but a lot of that is dependent on other changes (e.g. adding a profile_roles table) that haven't been defined yet.