Add audit system, invite links, and usage analytics (#4749)

# Description of Changes

New Features
Audit System: Complete audit logging with dashboard, event tracking, and
export capabilities

Invite Links: Secure invite system with email notifications and
expiration

Usage Analytics: Endpoint usage statistics and visualization

License Management: User counting with grandfathering and license
enforcement
## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: James Brunton <[email protected]>

frontend/src/core/components/layout/Workbench.tsx

@@ -1,3 +1,4 @@
+import React from 'react';
 import { Box } from '@mantine/core';
 import { useRainbowThemeContext } from '@app/components/shared/RainbowThemeProvider';
 import { useToolWorkflow } from '@app/contexts/ToolWorkflowContext';
@@ -7,7 +8,7 @@ import { useNavigationState, useNavigationActions } from '@app/contexts/Navigati
 import { isBaseWorkbench } from '@app/types/workbench';
 import { useViewer } from '@app/contexts/ViewerContext';
 import { useAppConfig } from '@app/contexts/AppConfigContext';
-import '@app/components/layout/Workbench.css';
+import styles from '@app/components/layout/Workbench.module.css';
 
 import TopControls from '@app/components/shared/TopControls';
 import FileEditor from '@app/components/fileEditor/FileEditor';
@@ -181,7 +182,7 @@ export default function Workbench() {
 
       {/* Main content area */}
       <Box
-        className="flex-1 min-h-0 relative z-10 workbench-scrollable "
+        className={`flex-1 min-h-0 relative z-10 ${styles.workbenchScrollable}`}
         style={{
           transition: 'opacity 0.15s ease-in-out',
           paddingTop: currentView === 'viewer' ? '0' : (activeFiles.length > 0 ? '3.5rem' : '0'),
@@ -191,7 +192,7 @@ export default function Workbench() {
       </Box>
 
       <Footer
-        analyticsEnabled={config?.enableAnalytics === true}
+        analyticsEnabled={config?.enableAnalytics ?? undefined}
         termsAndConditions={config?.termsAndConditions}
         privacyPolicy={config?.privacyPolicy}
         cookiePolicy={config?.cookiePolicy}