api: GET /api/v1/programs endpoints

[victorquinn]

Summary

Implement read API endpoints for programs: list with filtering/pagination/search, detail by slug, version history.

Files to Create

• app/api/v1/programs/route.ts — List endpoint
• app/api/v1/programs/[slug]/route.ts — Detail endpoint
• app/api/v1/programs/[slug]/versions/route.ts — Version history

Query Parameters (List)

• search — Full-text + trigram search
• status — Filter by program status
• assetType — Filter by asset type (JSONB contains)
• marketSegment — Filter by market segment
• gridService — Filter by grid service
• organizationId — Filter by organization
• fields, sort, order, cursor, limit — Standard pagination

Acceptance Criteria

• List endpoint with all filters including JSONB array filters
• Cursor-based pagination
• Detail by slug
• Version history
• Full-text search working
• npm run build passes

Spec ref: Sections 4.3–4.4
Blocked by: #5, #7 (API utilities, seed)
Blocks: Programs page migration