Restructure frontend code to allow for extensions (#4721)

# Description of Changes
Move frontend code into `core` folder and add infrastructure for
`proprietary` folder to include premium, non-OSS features

frontend/src/core/hooks/tools/removeCertificateSign/useRemoveCertificateSignOperation.ts

@@ -0,0 +1,29 @@
+import { useTranslation } from 'react-i18next';
+import { ToolType, useToolOperation } from '@app/hooks/tools/shared/useToolOperation';
+import { createStandardErrorHandler } from '@app/utils/toolErrorHandler';
+import { RemoveCertificateSignParameters, defaultParameters } from '@app/hooks/tools/removeCertificateSign/useRemoveCertificateSignParameters';
+
+// Static function that can be used by both the hook and automation executor
+export const buildRemoveCertificateSignFormData = (_parameters: RemoveCertificateSignParameters, file: File): FormData => {
+  const formData = new FormData();
+  formData.append("fileInput", file);
+  return formData;
+};
+
+// Static configuration object
+export const removeCertificateSignOperationConfig = {
+  toolType: ToolType.singleFile,
+  buildFormData: buildRemoveCertificateSignFormData,
+  operationType: 'removeCertSign',
+  endpoint: '/api/v1/security/remove-cert-sign',
+  defaultParameters,
+} as const;
+
+export const useRemoveCertificateSignOperation = () => {
+  const { t } = useTranslation();
+
+  return useToolOperation<RemoveCertificateSignParameters>({
+    ...removeCertificateSignOperationConfig,
+    getErrorMessage: createStandardErrorHandler(t('removeCertSign.error.failed', 'An error occurred while removing certificate signatures.'))
+  });
+};

frontend/src/core/hooks/tools/removeCertificateSign/useRemoveCertificateSignParameters.ts

@@ -0,0 +1,19 @@
+import { BaseParameters } from '@app/types/parameters';
+import { useBaseParameters, BaseParametersHook } from '@app/hooks/tools/shared/useBaseParameters';
+
+export interface RemoveCertificateSignParameters extends BaseParameters {
+  // Extends BaseParameters - ready for future parameter additions if needed
+}
+
+export const defaultParameters: RemoveCertificateSignParameters = {
+  // No parameters needed
+};
+
+export type RemoveCertificateSignParametersHook = BaseParametersHook<RemoveCertificateSignParameters>;
+
+export const useRemoveCertificateSignParameters = (): RemoveCertificateSignParametersHook => {
+  return useBaseParameters({
+    defaultParameters,
+    endpointName: 'remove-certificate-sign',
+  });
+};