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.

tests/Fakes/FakeArticleRepository.php

@@ -10,7 +10,7 @@ class FakeArticleRepository implements ArticleRepositoryInterface
     /** @var array<int, ArticleCandidateDTO> */
     public array $candidates = [];
 
-    public function findSimilarByEmbedding(array $embedding, int $limit = 5, array $embeddingContext = []): array
+    public function findSimilarByEmbedding(array $embedding, int $limit = 5, array $embeddingContext = [], array $filters = []): array
     {
         return array_slice($this->candidates, 0, $limit);
     }