feat(audit): introduce structured Audit API with export, stats, and cleanup endpoints (#4217)

# Description of Changes

- Added new REST-based `AuditDashboardController` under `/api/v1/audit`
with endpoints for:
  - Audit data retrieval with pagination (`/data`)
  - Statistics retrieval (`/stats`)
  - Export in CSV and JSON (`/export/csv`, `/export/json`)
  - Cleanup of audit events before a given date (`/cleanup/before`)
  - Retrieval of distinct audit event types (`/types`)
- Extracted web dashboard logic into `AuditDashboardWebController` (view
rendering only).
- Introduced new API models:
  - `AuditDataRequest`, `AuditDataResponse`
  - `AuditExportRequest`, `AuditDateExportRequest`
  - `AuditStatsResponse`
- Extended `PersistentAuditEventRepository` with richer query methods
(histograms, counts, top/latest events, distinct principals).
- Updated `dashboard.js` to use new API endpoints under `/api/v1/audit`.
- Enhanced authentication handlers and user endpoints with `@Audited`
annotations for login/logout/password change events.
- Cleaned up `LicenseKeyChecker` by removing unused `updateLicenseKey`
method.
- Moved admin-related controllers into `controller.api` namespace with
proper OpenAPI annotations (`@Operation`, `@Tag`).
- Improved `CleanUrlInterceptor` whitelist for new query parameters
(`days`, `date`).

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] 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)
- [x] I have performed a self-review of my own code
- [x] 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.

app/proprietary/src/main/resources/static/js/audit/dashboard.js

@@ -218,7 +218,7 @@ function loadAuditData(targetPage, realPageSize) {
     showLoading('table-loading');
 
     // Always request page 0 from server, but with increased page size if needed
-    let url = `/audit/data?page=${requestedPage}&size=${realPageSize}`;
+    let url = `/api/v1/audit/data?page=${requestedPage}&size=${realPageSize}`;
 
     if (typeFilter) url += `&type=${encodeURIComponent(typeFilter)}`;
     if (principalFilter) url += `&principal=${encodeURIComponent(principalFilter)}`;
@@ -302,7 +302,7 @@ function loadStats(days) {
     showLoading('user-chart-loading');
     showLoading('time-chart-loading');
 
-    fetchWithCsrf(`/audit/stats?days=${days}`)
+    fetchWithCsrf(`/api/v1/audit/stats?days=${days}`)
         .then(response => response.json())
         .then(data => {
             document.getElementById('total-events').textContent = data.totalEvents;
@@ -328,7 +328,7 @@ function exportAuditData(format) {
     const startDate = exportStartDateFilter.value;
     const endDate = exportEndDateFilter.value;
 
-    let url = format === 'json' ? '/audit/export/json?' : '/audit/export?';
+    let url = format === 'json' ? '/api/v1/audit/export/json?' : '/api/v1/audit/export/csv?';
 
     if (type) url += `&type=${encodeURIComponent(type)}`;
     if (principal) url += `&principal=${encodeURIComponent(principal)}`;
@@ -835,7 +835,7 @@ function hideLoading(id) {
 
 // Load event types from the server for filter dropdowns
 function loadEventTypes() {
-    fetchWithCsrf('/audit/types')
+    fetchWithCsrf('/api/v1/audit/types')
         .then(response => response.json())
         .then(types => {
             if (!types || types.length === 0) {