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/shared/schemas/results/ShoppingVendorFindManyResult.schema.ts

@@ -0,0 +1,20 @@
+import * as z from 'zod';
+export const ShoppingVendorFindManyResultSchema = z.object({
+  data: z.array(z.object({
+  id: z.number().int(),
+  userId: z.number().int(),
+  vendorName: z.string(),
+  websiteUrl: z.string(),
+  loginUsername: z.string(),
+  loginPassword: z.string(),
+  user: z.unknown()
+})),
+  pagination: z.object({
+  page: z.number().int().min(1),
+  pageSize: z.number().int().min(1),
+  total: z.number().int().min(0),
+  totalPages: z.number().int().min(0),
+  hasNext: z.boolean(),
+  hasPrev: z.boolean()
+})
+});