feat: transport incidents with truck number support

- DB: trucks table + incidents.truck_id FK + transport enum value
- Validation: transport type requires truck_id
- Create API: validates truck exists/active, persists truck_id
- Report form: truck dropdown shown when type=transport (required)
- Admin: TruckManager CRUD + /api/admin/trucks route
- Detail: trucks join surfaced in incident-detail + detail page query
- Inbox (HSE + supervisor): truck filter, transport in TYPE_OPTIONS,
  fixed stale enum values (dropped dangerous_occurrence/mhe_asset/occupational_disease)
- List: transport label + truck number badge in rows
- i18n: transport + truckLabel/truckPlaceholder in en/ms/zh

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ

app/(protected)/hse/incidents/[id]/page.tsx

@@ -25,6 +25,7 @@ export default async function HseIncidentDetailPage({ params }: Props) {
       reported_at, closed_at,
       sites (id, name),
       zones (id, name),
+      trucks (id, truck_no, carrier),
       reporter:users!reported_by (id, name, email),
       evidence_files (id, stage, file_url, file_type, uploaded_at)
     `)