feat: complete platform management features and enhance SEO

- Add comprehensive company management interface with editing, suspension
- Implement user invitation system within companies
- Add Add Company modal with form validation
- Create platform auth configuration in separate lib file
- Add comprehensive SEO metadata with OpenGraph and structured data
- Fix auth imports and route exports for Next.js 15 compatibility
- Add toast notifications with RadixUI components
- Update TODO status to reflect 100% completion of platform features

app/api/platform/companies/[id]/users/route.ts

@@ -0,0 +1,132 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getServerSession } from "next-auth";
+import { platformAuthOptions } from "../../../../../../lib/platform-auth";
+import { prisma } from "../../../../../../lib/prisma";
+import { hash } from "bcryptjs";
+
+// POST /api/platform/companies/[id]/users - Invite user to company
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const session = await getServerSession(platformAuthOptions);
+
+    if (!session?.user?.isPlatformUser || session.user.platformRole === "SUPPORT") {
+      return NextResponse.json({ error: "Admin access required" }, { status: 403 });
+    }
+
+    const { id: companyId } = await params;
+    const body = await request.json();
+    const { name, email, role = "USER" } = body;
+
+    if (!name || !email) {
+      return NextResponse.json({ error: "Name and email are required" }, { status: 400 });
+    }
+
+    // Check if company exists
+    const company = await prisma.company.findUnique({
+      where: { id: companyId },
+      include: { _count: { select: { users: true } } },
+    });
+
+    if (!company) {
+      return NextResponse.json({ error: "Company not found" }, { status: 404 });
+    }
+
+    // Check if user limit would be exceeded
+    if (company._count.users >= company.maxUsers) {
+      return NextResponse.json(
+        { error: "Company has reached maximum user limit" },
+        { status: 400 }
+      );
+    }
+
+    // Check if user already exists in this company
+    const existingUser = await prisma.user.findFirst({
+      where: {
+        email,
+        companyId,
+      },
+    });
+
+    if (existingUser) {
+      return NextResponse.json(
+        { error: "User already exists in this company" },
+        { status: 400 }
+      );
+    }
+
+    // Generate a temporary password (in a real app, you'd send an invitation email)
+    const tempPassword = `temp${Math.random().toString(36).slice(-8)}`;
+    const hashedPassword = await hash(tempPassword, 10);
+
+    // Create the user
+    const user = await prisma.user.create({
+      data: {
+        name,
+        email,
+        hashedPassword,
+        role,
+        companyId,
+        invitedBy: session.user.email,
+        invitedAt: new Date(),
+      },
+      select: {
+        id: true,
+        name: true,
+        email: true,
+        role: true,
+        createdAt: true,
+        invitedBy: true,
+        invitedAt: true,
+      },
+    });
+
+    // In a real application, you would send an email with login credentials
+    // For now, we'll return the temporary password
+    return NextResponse.json({
+      user,
+      tempPassword, // Remove this in production and send via email
+      message: "User invited successfully. In production, credentials would be sent via email.",
+    });
+  } catch (error) {
+    console.error("Platform user invitation error:", error);
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}
+
+// GET /api/platform/companies/[id]/users - Get company users
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const session = await getServerSession(platformAuthOptions);
+
+    if (!session?.user?.isPlatformUser) {
+      return NextResponse.json({ error: "Platform access required" }, { status: 401 });
+    }
+
+    const { id: companyId } = await params;
+
+    const users = await prisma.user.findMany({
+      where: { companyId },
+      select: {
+        id: true,
+        name: true,
+        email: true,
+        role: true,
+        createdAt: true,
+        invitedBy: true,
+        invitedAt: true,
+      },
+      orderBy: { createdAt: "desc" },
+    });
+
+    return NextResponse.json({ users });
+  } catch (error) {
+    console.error("Platform users list error:", error);
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}