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/components/layout/sidebar.tsx

@@ -30,6 +30,9 @@ import {
   Building2,
   Timer,
   BookOpen,
+  ShoppingCart,
+  Search,
+  KeyRound,
 } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { useMemo, useState, useEffect } from "react";
@@ -62,6 +65,7 @@ export function Sidebar() {
     const s = new Set<string>();
     if (location.startsWith("/chart")) s.add("/chart");
     if (location.startsWith("/settings")) s.add("/settings");
+    if (location.startsWith("/dental-shopping")) s.add("/dental-shopping");
     return s;
   });
 
@@ -72,6 +76,9 @@ export function Sidebar() {
     if (location.startsWith("/settings")) {
       setExpandedPaths((prev) => new Set([...prev, "/settings"]));
     }
+    if (location.startsWith("/dental-shopping")) {
+      setExpandedPaths((prev) => new Set([...prev, "/dental-shopping"]));
+    }
   }, [location]);
 
   const togglePath = (path: string) => {
@@ -162,6 +169,23 @@ export function Sidebar() {
         path: "/cloud-storage",
         icon: <Cloud className="h-5 w-5 text-sky-500" />,
       },
+      {
+        name: "AI Dental Shopping",
+        path: "/dental-shopping",
+        icon: <ShoppingCart className="h-5 w-5 text-cyan-500" />,
+        children: [
+          {
+            name: "Search / Tag",
+            path: "/dental-shopping/search-tag",
+            icon: <Search className="h-4 w-4 text-cyan-400" />,
+          },
+          {
+            name: "Login Info",
+            path: "/dental-shopping/login-info",
+            icon: <KeyRound className="h-4 w-4 text-cyan-400" />,
+          },
+        ],
+      },
       {
         name: "Database Management",
         path: "/database-management",