docs: align aftersales README and AGENTS conventions

AGENTS.md

@@ -104,6 +104,16 @@ src/
 - `PublicQuery` auto-redirects scanned `zjbf-sh-*` serials to `/aftersales/:serialNumber`
 - Shared public-page chrome (logo + 备案 footer) lives in `components/PublicLayout.tsx`
 
+### Aftersales Conventions
+- Aftersales serial format is `zjbf-sh-YYMMDDNN` (daily sequence), e.g. `zjbf-sh-26052801`.
+- Service type values must use `software` / `hardware` / `maintenance`:
+  - `software`: 软件故障
+  - `hardware`: 硬件故障
+  - `maintenance`: 售后维保
+- Use label text `问题描述反馈` for `issueDescription` in create/detail/public-confirm views.
+- In admin detail page, use `工单分配` as the UI label for reassign action.
+- Signature display text should be `客户确认签名`.
+
 ### State Management
 - Use React hooks (`useState`, `useEffect`) for local component state
 - Authentication state persisted in localStorage via authApi
@@ -190,4 +200,4 @@ export default PageName;
 ### Add a new component
 1. Create in `src/components/ComponentName.tsx`
 2. Add styles in `src/components/styles/ComponentName.css` if needed
-3. Import using `@/components/ComponentName`
+3. Import using `@/components/ComponentName`