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/EmbeddingServiceTest.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Exceptions\OllamaUnavailableException;
+use App\Models\EmbeddingCache;
+use App\Services\AppSettingsService;
+use App\Services\EmbeddingService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\Fakes\FakeLlmClient;
+use Tests\TestCase;
+
+class EmbeddingServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_it_returns_cached_embedding_without_new_llm_call(): void
+    {
+        $settings = $this->fakeSettings();
+        $llm = new FakeLlmClient;
+        $service = new EmbeddingService($llm, $settings);
+
+        EmbeddingCache::query()->create([
+            'provider_instance_id' => 'instance-1',
+            'embedding_model' => 'embed-model',
+            'text_hash' => hash('sha256', 'abc'),
+            'text' => 'abc',
+            'embedding' => [0.9, 0.8],
+        ]);
+
+        $embedding = $service->embed('abc');
+        $this->assertSame([0.9, 0.8], $embedding);
+        $this->assertCount(0, $llm->generatedPrompts);
+    }
+
+    public function test_it_throws_when_embedding_is_empty(): void
+    {
+        $settings = $this->fakeSettings();
+        $llm = new FakeLlmClient;
+        $llm->embeddings['abc'] = [];
+        $service = new EmbeddingService($llm, $settings);
+
+        $this->expectException(OllamaUnavailableException::class);
+        $service->embed('abc');
+    }
+
+    private function fakeSettings(): AppSettingsService
+    {
+        return new class extends AppSettingsService {
+            public function activeProviderInstance(): array
+            {
+                return ['id' => 'instance-1', 'embedding_model' => 'embed-model'];
+            }
+
+            public function activeProviderInstanceId(): string
+            {
+                return 'instance-1';
+            }
+
+            public function get(string $key, ?string $default = null): ?string
+            {
+                if ($key === 'llm.models.embedding') {
+                    return 'embed-model';
+                }
+
+                return $default;
+            }
+        };
+    }
+}