feat: implement platform management system with authentication and dashboard

- Add PlatformUser model with roles (SUPER_ADMIN, ADMIN, SUPPORT)
- Implement platform authentication with NextAuth
- Create platform dashboard showing companies, users, and sessions
- Add platform API endpoints for company management
- Update landing page with SaaS design
- Include test improvements and accessibility updates

prisma/seed-platform.ts

@@ -0,0 +1,63 @@
+import { PrismaClient, PlatformUserRole } from "@prisma/client";
+import bcrypt from "bcryptjs";
+
+const prisma = new PrismaClient();
+
+async function main() {
+  console.log("🚀 Seeding platform users for Notso AI...");
+
+  // Create initial platform admin user
+  const adminPassword = await bcrypt.hash("NotsoAI2024!Admin", 12);
+
+  const admin = await prisma.platformUser.upsert({
+    where: { email: "admin@notso.ai" },
+    update: {},
+    create: {
+      email: "admin@notso.ai",
+      password: adminPassword,
+      name: "Platform Administrator",
+      role: PlatformUserRole.SUPER_ADMIN,
+    },
+  });
+
+  console.log("✅ Created platform super admin:", admin.email);
+
+  // Create support user
+  const supportPassword = await bcrypt.hash("NotsoAI2024!Support", 12);
+
+  const support = await prisma.platformUser.upsert({
+    where: { email: "support@notso.ai" },
+    update: {},
+    create: {
+      email: "support@notso.ai",
+      password: supportPassword,
+      name: "Support Team",
+      role: PlatformUserRole.SUPPORT,
+    },
+  });
+
+  console.log("✅ Created platform support user:", support.email);
+
+  console.log("\n🔑 Platform Login Credentials:");
+  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
+  console.log("Super Admin:");
+  console.log("  Email: admin@notso.ai");
+  console.log("  Password: NotsoAI2024!Admin");
+  console.log("");
+  console.log("Support:");
+  console.log("  Email: support@notso.ai");
+  console.log("  Password: NotsoAI2024!Support");
+  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
+  console.log("\n🌐 Platform Access:");
+  console.log("  Login: http://localhost:3000/platform/login");
+  console.log("  Dashboard: http://localhost:3000/platform/dashboard");
+}
+
+main()
+  .catch((e) => {
+    console.error("❌ Platform seeding failed:", e);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+  });