feat: add AI Dental Shopping section with sidebar nav and Login Info page

- Add AI Dental Shopping to sidebar with Search/Tag and Login Info sub-pages
- Build full-stack Login Info CRUD: save vendor name, website, username, password per user
- Add ShoppingVendor Prisma model, run db push, regenerate client and Zod schemas
- Add storage layer, REST API at /api/shopping-vendors/, and frontend table with add/edit/delete modal

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/App.tsx

@@ -29,6 +29,8 @@ const ReportsPage = lazy(() => import("./pages/reports-page"));
 const CloudStoragePage = lazy(() => import("./pages/cloud-storage-page"));
 const JobMonitorPage = lazy(() => import("./pages/job-monitor-page"));
 const ChartPage = lazy(() => import("./pages/chart-page"));
+const DentalShoppingSearchTagPage = lazy(() => import("./pages/dental-shopping-search-tag-page"));
+const DentalShoppingLoginInfoPage = lazy(() => import("./pages/dental-shopping-login-info-page"));
 const NotFound = lazy(() => import("./pages/not-found"));
 
 function Router() {
@@ -61,6 +63,8 @@ function Router() {
       />
       <ProtectedRoute path="/reports" component={() => <ReportsPage />} />
       <ProtectedRoute path="/cloud-storage" component={() => <CloudStoragePage />} />
+      <ProtectedRoute path="/dental-shopping/search-tag" component={() => <DentalShoppingSearchTagPage />} />
+      <ProtectedRoute path="/dental-shopping/login-info" component={() => <DentalShoppingLoginInfoPage />} />
       <ProtectedRoute
         path="/job-monitor"
         component={() => <JobMonitorPage />}