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/FakeLlmClient.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Services\Llm\LlmClientInterface;
+
+class FakeLlmClient implements LlmClientInterface
+{
+    /** @var array<string, array<int, float>> */
+    public array $embeddings = [];
+
+    /** @var array<int, string> */
+    public array $responses = [];
+
+    /** @var array<int, array{prompt:string, options:array}> */
+    public array $generatedPrompts = [];
+
+    public function embed(string $text): array
+    {
+        return $this->embeddings[$text] ?? [0.1, 0.2, 0.3];
+    }
+
+    public function generate(string $prompt, array $options = []): string
+    {
+        $this->generatedPrompts[] = [
+            'prompt' => $prompt,
+            'options' => $options,
+        ];
+
+        return array_shift($this->responses) ?? '{}';
+    }
+}