Added the support for generating docs from template doc

app/Services/Documents/DocumentSettings.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Services\Documents;
+
+use App\Models\DocumentSetting;
+use Illuminate\Support\Facades\Cache;
+
+class DocumentSettings
+{
+    private const CACHE_KEY = 'document_settings_singleton_v1';
+
+    public function get(): DocumentSetting
+    {
+        return Cache::remember(self::CACHE_KEY, 300, fn () => DocumentSetting::instance());
+    }
+
+    public function refresh(): DocumentSetting
+    {
+        Cache::forget(self::CACHE_KEY);
+
+        return $this->get();
+    }
+
+    public function fresh(): DocumentSetting
+    {
+        return $this->refresh();
+    }
+}

app/Services/Documents/Exceptions/UnresolvedTokensException.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Services\Documents\Exceptions;
+
+use RuntimeException;
+
+class UnresolvedTokensException extends RuntimeException
+{
+    /** @var array<int,string> */
+    public array $unresolved;
+
+    /**
+     * @param  array<int,string>  $unresolved
+     */
+    public function __construct(array $unresolved, string $message = 'Unresolved tokens remain in template.')
+    {
+        parent::__construct($message);
+        $this->unresolved = $unresolved;
+    }
+}

app/Services/Documents/TokenScanner.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Services\Documents;
+
+class TokenScanner
+{
+    private const REGEX = '/{{\s*([a-zA-Z0-9_]+\.[a-zA-Z0-9_]+)\s*}}/';
+
+    /**
+     * @return array<int,string>
+     */
+    public function scan(string $content): array
+    {
+        preg_match_all(self::REGEX, $content, $m);
+        if (empty($m[1])) {
+            return [];
+        }
+
+        return array_values(array_unique($m[1]));
+    }
+}