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>

packages/db/generated/prisma/index-browser.js

@@ -271,6 +271,15 @@ exports.Prisma.InsuranceCredentialScalarFieldEnum = {
   password: 'password'
 };
 
+exports.Prisma.ShoppingVendorScalarFieldEnum = {
+  id: 'id',
+  userId: 'userId',
+  vendorName: 'vendorName',
+  websiteUrl: 'websiteUrl',
+  loginUsername: 'loginUsername',
+  loginPassword: 'loginPassword'
+};
+
 exports.Prisma.PdfGroupScalarFieldEnum = {
   id: 'id',
   title: 'title',
@@ -619,6 +628,7 @@ exports.Prisma.ModelName = {
   ServiceLine: 'ServiceLine',
   ClaimFile: 'ClaimFile',
   InsuranceCredential: 'InsuranceCredential',
+  ShoppingVendor: 'ShoppingVendor',
   PdfGroup: 'PdfGroup',
   PdfFile: 'PdfFile',
   Payment: 'Payment',