Add aftersales work order frontend pages

- Public scan-to-confirm page (/aftersales/:sn) with phone last-4 verification
- Admin list + detail pages with state machine, QR generation, reassign, force-close
- PublicLayout extracted from PublicQuery so both pages share logo + 备案 chrome
- PublicQuery auto-redirects scanned zjbf-sh-* serials to the aftersales page
- AdminLayout: new 售后工单 menu entry

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pages/styles/AftersalesConfirm.css

@@ -0,0 +1,54 @@
+.aftersales-confirm-card {
+  max-width: 560px;
+}
+
+.aftersales-title {
+  font-size: clamp(1.4rem, 4vw, 1.75rem);
+  font-weight: bold;
+  color: #165DFF;
+  text-align: center;
+  margin: 12px 0 4px;
+}
+
+.aftersales-serial {
+  text-align: center;
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+  color: #4B5563;
+  margin: 0 0 16px;
+  letter-spacing: 1px;
+}
+
+.aftersales-details .detail-item-block {
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 6px;
+}
+
+.aftersales-details .value-block {
+  white-space: pre-wrap;
+  word-break: break-word;
+  text-align: left;
+  width: 100%;
+}
+
+.aftersales-phone-verify {
+  margin-top: 24px;
+  padding-top: 24px;
+  border-top: 1px solid rgba(0, 0, 0, 0.06);
+}
+
+.aftersales-phone-tip {
+  color: #4B5563;
+  margin: 0 0 12px;
+  font-size: 14px;
+}
+
+.aftersales-actions {
+  display: flex;
+  gap: 12px;
+  margin-top: 20px;
+}
+
+.aftersales-actions > button {
+  flex: 1;
+}