Feat/vitals queue workflow

Related Issue: Closes #120 (closed)

Summary

Implements mandatory vitals recording workflow. Patients must record vitals before entering consultation. Adds Vitals Queue page, auto-loads patients in vitals form, sequences API calls, and prevents consultation start without vitals.

Changes

• Add vitals status to QueueStatusEnum
• Create VitalsQueuePage component
• Enhance RecordVitalsPage with auto-load and sequential API calls
• Update PatientCard with vitals badge and buttons
• Add vitals queue route and dashboard button
• Add vitals validation to ConsultationQueuePage

Testing

1. Navigate to /volunteer/vitals-queue
2. Click "Complete Vitals" → navigate to /volunteer/record-vitals?bookNo=<n> with patient auto-loaded
3. Fill vitals and save → verify POST then PUT in DevTools Network
4. Confirm redirect to vitals queue and patient appears in consultation queue
5. Attempt to start consultation on vitals patient → blocked

Validation

• TypeScript: 0 errors (npx tsc --noEmit)
• Build passes (bun run build)
• No breaking changes
• Backend aware of API usage