feat: Enhance Support Reply Service with tone instructions and article details

- Added tone instruction retrieval to SupportReplyService.
- Improved user feedback when no relevant article is found.
- Included article URL and tone instruction in LLM prompt.
- Updated response format to include source information.
- Enhanced article management UI with search functionality and editing capabilities.
- Introduced a new API endpoint for nearest articles based on vector search.
- Added confidence badge component to display article confidence levels.
- Implemented tests for article searching, editing, and nearest article API.
- Removed obsolete .htaccess file.

tests/Feature/NearestArticleApiTest.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\DTOs\ArticleCandidateDTO;
+use App\Repositories\Contracts\ArticleRepositoryInterface;
+use App\Services\EmbeddingService;
+use Mockery;
+use Tests\Fakes\FakeArticleRepository;
+use Tests\TestCase;
+
+class NearestArticleApiTest extends TestCase
+{
+    public function test_it_returns_nearest_published_articles(): void
+    {
+        $embeddingService = Mockery::mock(EmbeddingService::class);
+        $embeddingService
+            ->shouldReceive('embed')
+            ->once()
+            ->with('Hoe stel ik DNS in?')
+            ->andReturn([0.1, 0.2, 0.3]);
+        $embeddingService
+            ->shouldReceive('context')
+            ->once()
+            ->andReturn([
+                'provider_instance_id' => 'instance-1',
+                'embedding_model' => 'embed-model',
+            ]);
+
+        $repository = new FakeArticleRepository;
+        $repository->candidates = [
+            new ArticleCandidateDTO(
+                articleId: 10,
+                title: 'DNS instellen',
+                content: 'Open het DNS beheer en voeg de juiste records toe.',
+                distance: 0.12,
+                sourceUrl: 'https://example.test/articles/dns'
+            ),
+        ];
+
+        $this->app->instance(EmbeddingService::class, $embeddingService);
+        $this->app->instance(ArticleRepositoryInterface::class, $repository);
+
+        $response = $this->getJson('/api/articles/nearest?query=Hoe%20stel%20ik%20DNS%20in%3F&limit=5');
+
+        $response
+            ->assertOk()
+            ->assertJsonPath('data.0.article_id', 10)
+            ->assertJsonPath('data.0.title', 'DNS instellen')
+            ->assertJsonPath('data.0.similarity', 0.88)
+            ->assertJsonPath('data.0.content', null)
+            ->assertJsonPath('meta.published_only', true)
+            ->assertJsonPath('meta.embedding_model', 'embed-model');
+    }
+
+    public function test_it_validates_the_search_query(): void
+    {
+        $response = $this->getJson('/api/articles/nearest?query=x');
+
+        $response->assertStatus(422);
+    }
+}