feat: add ScriptManagePage with routing and 'Manage Templates' link

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/ScriptLibraryPage.tsx

@@ -1,5 +1,6 @@
 import { useState, useEffect } from 'react'
-import { Terminal } from 'lucide-react'
+import { Link } from 'react-router-dom'
+import { Terminal, Settings } from 'lucide-react'
 import { useScriptGeneratorStore } from '@/store/scriptGeneratorStore'
 import { usePermissions } from '@/hooks/usePermissions'
 import { ScriptFilterBar } from '@/components/scripts/ScriptFilterBar'
@@ -49,6 +50,15 @@ export default function ScriptLibraryPage() {
         <p className="text-sm text-muted-foreground mt-1">
           Browse PowerShell templates, fill in parameters, and generate ready-to-run scripts.
         </p>
+        {isEngineer && (
+          <Link
+            to="/scripts/manage"
+            className="inline-flex items-center gap-1.5 text-xs text-muted-foreground hover:text-foreground transition-colors mt-2"
+          >
+            <Settings size={12} />
+            Manage Templates
+          </Link>
+        )}
       </div>
 
       {/* Two-column layout */}