Add unit and feature tests for ticket processing and article management

- Implement Fake repositories and services for testing purposes.
- Create tests for Article API including creation, validation, and listing.
- Develop ProcessTicketJobFlowTest to validate ticket processing logic.
- Add QuickReplyAdminTest for creating and updating quick replies.
- Implement TicketAndArticleModelTest to ensure proper cascading deletes and credential encryption.
- Create TicketIngestionTest for ticket creation and job dispatching.
- Add TicketShowPageTest to verify rendering of quick replies and tool calls.
- Implement unit tests for ClassifierPromptBuilder, EmbeddingService, LlmJsonDecoder, QuickReplyResolver, SupportReplyService, TicketResultPayloadBuilder, TicketToolCallService, and ToolCallRequestValidator.

tests/Fakes/FakeArticleRepository.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\DTOs\ArticleCandidateDTO;
+use App\Repositories\Contracts\ArticleRepositoryInterface;
+
+class FakeArticleRepository implements ArticleRepositoryInterface
+{
+    /** @var array<int, ArticleCandidateDTO> */
+    public array $candidates = [];
+
+    public function findSimilarByEmbedding(array $embedding, int $limit = 5, array $embeddingContext = []): array
+    {
+        return array_slice($this->candidates, 0, $limit);
+    }
+}