Create the required setup foundation docs for the project below.

Project name: App Setup Flow
Repo name: app-setup-flow
Folder name: app-setup-flow
One-line description: A guided setup tool for starting Next.js web app projects with exact steps, prompts, and done states.
Target audience: The product creator setting up new web app foundations.
Primary goal: Move from app idea to an agent-ready Next.js backbone.
Primary visitor action: Walk the flow phase by phase and copy the required commands and prompts.
Secondary actions:
Refine the project brief
Review generated outputs
Verify the backbone locally

Routes and pages:
/
/setup/intake
/setup/scaffold
/setup/docs
/setup/files
/setup/backbone
/setup/verify

Visual direction:
Warm off-white background, white and cool-tinted cards, anthracite text, light blue accents, subtle borders, subtle shadows.

UX rules:
Mobile first
Visible input labels
Copy buttons must be obvious
Current phase stays visible
Every setup page includes previous and next navigation

Constraints:
Next.js App Router
TypeScript
Tailwind CSS
Vercel
No auth in v1
No backend in v1
No analytics in v1
No CMS in v1

Required shared components:
Header
Footer
Container
Section
Card
Button
Input
Textarea
Phase progress nav
Code block with copy button
Prompt block with copy button
Checklist

Required UI states:
Default
Hover
Focus
Active phase
Empty context notice
Checklist complete state

Definition of done:
All main routes exist
Global layout exists
Shared UI primitives exist
Commands and prompts are easy to copy on mobile
The foundation can be refined without redesigning the structure

Return exactly these files with short direct copy:
- docs/brief.md
- docs/sitemap.md
- docs/ui-system.md
- docs/ux-rules.md
- docs/content-model.md

Keep the product as a guided setup tool for Next.js web app projects. Do not turn it into a marketing site or a generic docs site.