Flutter Appstore Doc Ui Kit

# Flutter AppStore Doc + UI Kit

Generate an App Store-ready pack in gated stages with mandatory user review between stages:

- `docs/app-feature-spec.zh-CN.md` + `docs/app-feature-spec.en-US.md`
- `ui/*.png` (AI-generated Apple-style page design images)
- `icon/app_icon_1024.png` + `icon/app_icon_1024.svg` (square-corner icon)

## Workflow (Approval-Gated)

1. Generate APP feature docs in Chinese + English and output them.
2. Ask user to download/review docs; wait for: **continue** or **revise docs**.
3. Proceed only after user explicitly approves docs.
4. Confirm image-generation capability:
   - If API/model access exists, generate page-level UI images from approved docs.
   - If no API/model access, output one unified style prompt package for user-side generation.
5. Ask user to download/review UI images.
6. Proceed only after user explicitly approves UI images.
7. Confirm icon-generation capability:
   - If API/model access exists, generate icon via model.
   - If no API/model access, generate icon with programmatic SVG->PNG pipeline.
8. Ask user to review icon.
9. Finish only after user explicitly approves icon.

Do not auto-skip any gate. If user asks for changes, revise only that stage and re-submit for approval.

## 1) Required Inputs

Collect/confirm:

- App name
- Target language(s)
- Preferred app direction (if none, pick a low-saturation utility direction)
- Optional color style

Hard constraints to enforce:

- Tech stack: Flutter via **FVM Flutter 3.35.1**
- Includes **camera** + **photo library** permissions
- Avoid over-saturated app categories and avoid risky claim patterns
- No backend server required
- No TODO placeholders or temporary/fake data sections
- Focus on complete v1 only (no future-roadmap content)
- Can include general capabilities: i18n, dark mode, accessibility, privacy-first local storage
- App icon must be **square-corner** (not rounded)

## 2) Stage 1 — Generate and Deliver Feature Docs (ZH + EN)

Run once:

```bash
python3 script...