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.

app/Repositories/ArticleRepository.php

@@ -9,13 +9,20 @@ use App\Repositories\Contracts\ArticleRepositoryInterface;
 
 class ArticleRepository implements ArticleRepositoryInterface
 {
-    public function findSimilarByEmbedding(array $embedding, int $limit = 5, array $embeddingContext = []): array
+    public function findSimilarByEmbedding(array $embedding, int $limit = 5, array $embeddingContext = [], array $filters = []): array
     {
         $vector = '['.implode(',', array_map(static fn ($value) => (float) $value, $embedding)).']';
 
         $chunkDistances = ArticleChunk::query()
             ->selectRaw('article_id, MIN(embedding <=> ?::vector) as distance', [$vector])
             ->whereNotNull('embedding')
+            ->when((bool) ($filters['published_only'] ?? false), function ($query) {
+                $query->whereHas('article', function ($articleQuery) {
+                    $articleQuery
+                        ->where('status', 'published')
+                        ->where('is_ai_draft', false);
+                });
+            })
             ->when($embeddingContext !== [], function ($query) use ($embeddingContext) {
                 $query
                     ->where('embedding_provider_instance_id', $embeddingContext['provider_instance_id'] ?? null)