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/shared/QuickAccessBar.tsx

@@ -1,6 +1,7 @@
 import React, { useState, useRef, forwardRef, useEffect } from "react";
 import { ActionIcon, Stack, Divider } from "@mantine/core";
 import { useTranslation } from 'react-i18next';
+import { useNavigate, useLocation } from 'react-router-dom';
 import LocalIcon from '@app/components/shared/LocalIcon';
 import { useRainbowThemeContext } from "@app/components/shared/RainbowThemeProvider";
 import { useIsOverflowing } from '@app/hooks/useIsOverflowing';
@@ -23,6 +24,8 @@ import {
 
 const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
   const { t } = useTranslation();
+  const navigate = useNavigate();
+  const location = useLocation();
   const { isRainbowMode } = useRainbowThemeContext();
   const { openFilesModal, isFilesModalOpen } = useFilesModalContext();
   const { handleReaderToggle, handleToolSelect, selectedToolKey, leftPanelView, toolRegistry, readerMode, resetTool } = useToolWorkflow();
@@ -34,6 +37,12 @@ const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
   const scrollableRef = useRef<HTMLDivElement>(null);
   const isOverflow = useIsOverflowing(scrollableRef);
 
+  // Open modal if URL is at /settings/*
+  useEffect(() => {
+    const isSettings = location.pathname.startsWith('/settings');
+    setConfigModalOpen(isSettings);
+  }, [location.pathname]);
+
   useEffect(() => {
     const next = getActiveNavButton(selectedToolKey, readerMode);
     setActiveButton(next);
@@ -180,6 +189,7 @@ const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
       size: 'lg',
       type: 'modal',
       onClick: () => {
+        navigate('/settings/overview');
         setConfigModalOpen(true);
       }
     }