## Context

The Uni-app frontend already obtains the authenticated user through `GET /api/auth/me`. That user includes `user_type` and `shop_id`; `GET /api/admin/shops/{shop_id}` returns the shop's `distribution_code`. The home page currently has an agent-only “提现管理” shortcut, and `src/static/icons/分销码.png` is present as an untracked user-supplied asset.

## Goals / Non-Goals

- Goals: expose a role-restricted shortcut after withdrawal management and show the current shop's distribution code as a scannable QR code.
- Non-Goals: change backend contracts, generate or rotate distribution codes, or expose another shop's code.

## Decisions

- Use the current authenticated user's `shop_id` from `/api/auth/me`; do not hardcode a shop ID or accept one from the page URL.
- Fetch the shop record through a typed shop-detail API method and encode the returned `distribution_code` value itself in the QR code.
- Generate/render the QR code locally with a Uni-app-compatible solution. Do not send distribution codes to a remote QR-generation service.
- Add a dedicated page, use the supplied icon for the home shortcut, and re-check the current user type on the page so direct navigation does not bypass the agent-only UI.
- Show a clear unavailable/error state when the account has no `shop_id`, the shop response has no distribution code, or the request fails.

## Risks / Trade-offs

- QR rendering APIs differ across Uni-app targets. Select a local renderer compatible with the project's supported H5 and mini-program builds and verify it in the target runtime.
- The supplied icon is currently untracked; implementation must preserve and use it without replacing or deleting it.