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/TicketResultPayloadBuilderTest.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Models\QuickReply;
+use App\Models\TicketToolCall;
+use App\Services\TicketResultPayloadBuilder;
+use PHPUnit\Framework\TestCase;
+
+class TicketResultPayloadBuilderTest extends TestCase
+{
+    public function test_it_builds_payload_with_optional_fields(): void
+    {
+        $builder = new TicketResultPayloadBuilder;
+        $quickReply = new QuickReply(['id' => 7, 'title' => 'Quick']);
+        $quickReply->id = 7;
+        $toolCall = new TicketToolCall(['action' => 'domain_inf', 'status' => 'success']);
+
+        $payload = $builder->build(
+            [
+                'top_3_candidates' => [['article_id' => 1]],
+                'top_5_candidates' => [['article_id' => 1], ['article_id' => 2]],
+                'classifier_raw_response' => ['mode' => 'llm'],
+                'requested_tool_call' => ['action' => 'domain_inf'],
+            ],
+            $toolCall,
+            $quickReply,
+            false,
+            null
+        );
+
+        $this->assertSame(7, $payload['quick_reply']['id']);
+        $this->assertSame('domain_inf', $payload['requested_tool_call']['action']);
+        $this->assertFalse($payload['knowledge_gap']);
+    }
+}