Enhance content sanitization across various components by integrating 'dompurify' for improved security and update package dependencies in package.json and package-lock.json.

server/api/membership/update-status.put.js

@@ -31,6 +31,14 @@ export default defineEventHandler(async (event) => {
       })
     }
     
+    // Validiere ID (sollte UUID-Format sein)
+    if (!id || typeof id !== 'string' || !/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(id)) {
+      throw createError({
+        statusCode: 400,
+        statusMessage: 'Ungültige ID'
+      })
+    }
+    
     const dataDir = path.join(process.cwd(), 'server/data/membership-applications')
     const filePath = path.join(dataDir, `${id}.json`)