Align audit template and add premises profile wizard

[jonbur]

Summary

Aligns the audit seed with the official Scout Association September 2025 template and delivers the premises profile wizard (build step 2 from CONTEXT.md).

Audit template alignment

• 25 sections using Appendix A titles (Organisation of safety and management, Fire, Gas, etc.)
• 100 check items (4 per section) with scope: all | extended
• Sections 18 & 21 filled as Safeguarding and Sleeping Accommodation (not separately named in SA template)

Premises profile wizard

• 5-step guided flow at /premises/[id]/profile
• Saves PremisesProfile and recomputes applicableSections on every save
• lib/sections.ts — profile-driven section filtering (e.g. no gas → exclude Gas section)
• API: GET/PUT /api/premises/[id]/profile returns { data, error }

Dev setup

npm run docker:up && npm run db:seed
npm run dev
# → http://localhost:3000/premises/dev-premises-hut/profile

Tested

• Build passes
• Profile PUT returns correct applicable sections for sample hut (gas + grounds → 19 sections)
• Health check still reports 25 template sections