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/ToolCallRequestValidatorTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Services\ToolCallRequestValidator;
+use PHPUnit\Framework\TestCase;
+
+class ToolCallRequestValidatorTest extends TestCase
+{
+    public function test_it_validates_domain_inf_tool_call(): void
+    {
+        $validator = new ToolCallRequestValidator;
+        $validated = $validator->validate([
+            'action' => 'domain_inf',
+            'parameters' => ['sld' => 'Example', 'tld' => 'NL'],
+            'reason' => 'Needed',
+        ]);
+
+        $this->assertSame([
+            'action' => 'domain_inf',
+            'parameters' => ['sld' => 'example', 'tld' => 'nl'],
+            'reason' => 'Needed',
+        ], $validated);
+    }
+
+    public function test_it_rejects_missing_parameters(): void
+    {
+        $validator = new ToolCallRequestValidator;
+
+        $this->assertNull($validator->validate([
+            'action' => 'domain_inf',
+            'parameters' => ['sld' => 'example'],
+        ]));
+    }
+
+    public function test_it_rejects_unknown_action(): void
+    {
+        $validator = new ToolCallRequestValidator;
+
+        $this->assertNull($validator->validate([
+            'action' => 'dns_update',
+            'parameters' => ['sld' => 'example', 'tld' => 'nl'],
+        ]));
+    }
+}