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/objects/ShoppingVendorArgs.schema.ts

@@ -0,0 +1,11 @@
+import * as z from 'zod';
+import type { Prisma } from '../../../generated/prisma';
+import { ShoppingVendorSelectObjectSchema as ShoppingVendorSelectObjectSchema } from './ShoppingVendorSelect.schema';
+import { ShoppingVendorIncludeObjectSchema as ShoppingVendorIncludeObjectSchema } from './ShoppingVendorInclude.schema'
+
+const makeSchema = () => z.object({
+  select: z.lazy(() => ShoppingVendorSelectObjectSchema).optional(),
+  include: z.lazy(() => ShoppingVendorIncludeObjectSchema).optional()
+}).strict();
+export const ShoppingVendorArgsObjectSchema = makeSchema();
+export const ShoppingVendorArgsObjectZodSchema = makeSchema();