Adds a server-side CSV export covering all campaign, proof, and version
data including agent RAG statuses. The export respects the active agency
filter so oversight admins can scope the download to a single agency.
- backend: `CampaignRepository.get_export_rows()` — flat join across
Campaign → Proof → ProofVersion with Agency and User, extracts agent
RAG statuses from the `agent_review` JSONB column
- backend: `GET /api/export/campaigns-csv` endpoint gated to
super_admin / oversight_admin, streams a dated CSV file
- frontend: `apiService.downloadCampaignsCsv(agencyId?)` — fetches blob
and triggers browser download
- frontend: threads `selectedAgencyId` prop from App → Campaigns →
CampaignList so the export uses the active filter
- frontend: Export CSV button in CampaignList header, visible only to
super_admin / oversight_admin, with spinner while downloading
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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