feat(tags): match add-tag modal to tauri design (preset swatches + active toggle)

- TagsSettingsPage modal: replace native color input with 4 preset
  swatches, add 'وضعیت برچسب' active toggle, update labels and submit
  button to mirror tauri AddPurchaseSubTabModal
- TenantTagController::create now honors an optional 'active' flag
  (defaults true, non-breaking for existing callers)
- tests: backend active-flag case, frontend preset-color + inactive case
- docs/api/tag.md: document the new create 'active' field

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Tag/Controller/TenantTagController.php

@@ -68,6 +68,9 @@ class TenantTagController extends BaseController
         }
 
         $tag = new TenantTag($type, $id, $name, $color);
+        if (array_key_exists('active', $data)) {
+            $tag->setActive((bool) $data['active']);
+        }
         $this->tagRepo->save($tag);
 
         return $this->success($tag->toArray(), 201);