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.

app/Services/AppSettingsService.php

@@ -130,6 +130,20 @@ class AppSettingsService
         return $default;
     }
 
+    public function toneAddressing(): string
+    {
+        return $this->get('tone_addressing', 'je') === 'u' ? 'u' : 'je';
+    }
+
+    public function toneInstruction(): string
+    {
+        if ($this->toneAddressing() === 'u') {
+            return 'Als de klanttaal Nederlands is: spreek de klant consequent formeel aan met u/uw. Gebruik geen je/jij/jouw.';
+        }
+
+        return 'Als de klanttaal Nederlands is: spreek de klant consequent informeel aan met je/jij/jouw. Gebruik geen u/uw.';
+    }
+
     public function promptSettings(): array
     {
         $settings = $this->all();