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/Unit/ClassifierPromptBuilderTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\DTOs\ArticleCandidateDTO;
+use App\Services\ClassifierPromptBuilder;
+use PHPUnit\Framework\TestCase;
+
+class ClassifierPromptBuilderTest extends TestCase
+{
+    public function test_it_builds_prompt_with_articles_notes_and_actions(): void
+    {
+        $builder = new ClassifierPromptBuilder;
+        $prompt = $builder->build(
+            'Base prompt',
+            'Hoe stel ik DNS in?',
+            [
+                new ArticleCandidateDTO(
+                    articleId: 10,
+                    title: 'DNS',
+                    content: 'Stappen voor DNS.',
+                    distance: 0.12,
+                    sourceUrl: 'https://example.test/article',
+                    note: 'Alleen gebruiken voor DNS.',
+                    allowedActions: ['domain_inf']
+                ),
+            ],
+            'nl'
+        );
+
+        $this->assertStringContainsString('Base prompt', $prompt);
+        $this->assertStringContainsString('User language: nl', $prompt);
+        $this->assertStringContainsString('Allowed actions: ["domain_inf"]', $prompt);
+        $this->assertStringContainsString('Internal note for support assistant', $prompt);
+        $this->assertStringContainsString('"tool_call"', $prompt);
+    }
+}