Add reusable project templates

app/Http/Requests/StoreProjectRequest.php

@@ -49,7 +49,7 @@ class StoreProjectRequest extends FormRequest
     public function rules(): array
     {
         return [
-            'creation_mode' => ['required', 'string', Rule::in(['scratch', 'duplicate'])],
+            'creation_mode' => ['required', 'string', Rule::in(['scratch', 'duplicate', 'template'])],
             'key' => [
                 'required',
                 'string',
@@ -81,6 +81,12 @@ class StoreProjectRequest extends FormRequest
                     }
                 },
             ],
+            'source_template_id' => [
+                Rule::requiredIf(fn (): bool => $this->input('creation_mode') === 'template'),
+                'nullable',
+                'integer',
+                Rule::exists('project_templates', 'id'),
+            ],
             'copy_areas' => ['nullable', 'array'],
             'copy_areas.*' => [
                 'string',
@@ -96,6 +102,7 @@ class StoreProjectRequest extends FormRequest
     {
         return [
             'source_project_id.required' => 'Select a source project to duplicate from.',
+            'source_template_id.required' => 'Select a template to create the project from.',
         ];
     }
 }