feat: Enhance Support Reply Service with tone instructions and article details

- Added tone instruction retrieval to SupportReplyService.
- Improved user feedback when no relevant article is found.
- Included article URL and tone instruction in LLM prompt.
- Updated response format to include source information.
- Enhanced article management UI with search functionality and editing capabilities.
- Introduced a new API endpoint for nearest articles based on vector search.
- Added confidence badge component to display article confidence levels.
- Implemented tests for article searching, editing, and nearest article API.
- Removed obsolete .htaccess file.

routes/web.php

@@ -10,6 +10,7 @@ Route::get('/', function () {
 Route::prefix('admin')->group(function () {
     Route::view('/dashboard', 'admin.dashboard')->name('admin.dashboard');
     Route::view('/articles', 'admin.articles')->name('admin.articles');
+    Route::view('/knowledge-search-demo', 'admin.knowledge-search-demo')->name('admin.knowledge-search-demo');
     Route::view('/quick-replies', 'admin.quick-replies')->name('admin.quick-replies');
     Route::view('/tickets', 'admin.tickets')->name('admin.tickets');
     Route::get('/tickets/{ticket}', [AdminTicketController::class, 'show'])->name('admin.tickets.show');