fix(route): SolutionPage 폴백 라우트 추가

frontend/src/pages/SolutionPage.jsx

@@ -287,6 +287,7 @@ export default function SolutionPage() {
       <Route path="erp" element={<ERP />} />
       <Route path="crm" element={<CRM />} />
       <Route path="bi"  element={<BI />} />
+      <Route path="*"   element={<ERP />} />
     </Routes>
   );
 }