Harden API token auth for deleted users and add route rate limiting

src/app/api/admin/api-tokens/route.ts

@@ -8,6 +8,7 @@ import crypto from 'crypto';
 import { requireAuth, requireAdmin, AuthenticatedRequest } from '@/lib/middleware/auth';
 import { prisma } from '@/lib/db';
 import { RMABLogger } from '@/lib/utils/logger';
+import { checkApiTokenCreateRateLimit } from '@/lib/utils/apiTokenRateLimit';
 import { z } from 'zod';
 
 const logger = RMABLogger.create('API.Admin.ApiTokens');
@@ -74,6 +75,19 @@ export async function POST(request: NextRequest) {
   return requireAuth(request, (req: AuthenticatedRequest) =>
     requireAdmin(req, async () => {
       try {
+        const rateLimit = checkApiTokenCreateRateLimit(req.user!.id);
+        if (!rateLimit.allowed) {
+          return NextResponse.json(
+            { error: 'Too many API token create attempts. Please try again later.' },
+            {
+              status: 429,
+              headers: {
+                'Retry-After': String(rateLimit.retryAfterSeconds),
+              },
+            }
+          );
+        }
+
         const body = await req.json();
         const { name, expiresAt, userId, role } = CreateTokenSchema.parse(body);