Org profile upcoming events render blank — field name mismatch

## Bug The upcoming events section on the organization profile page renders blank because the frontend type uses different field names than what the backend sends. ## Details Frontend ProfileEventItem has: - name: string — but backend sends title - start_date: string — but backend sends starts_at Since the fields do not match, the values are undefined and events appear blank. ## Fix Align frontend ProfileEventItem field names: - name → title - start_date → starts_at Also: backend OrganizationProfile.upcoming_events is typed as bare list — should be list[ProfileEventItem] with a proper schema. ## Found by API contract audit (2026-03-19)