feat(api): generate OpenAPI spec with Scramble for api-docs.invoiceshelf.com

Auto-generate an OpenAPI 3.1 spec from the v1 API's FormRequests and Resources
(no annotations) for publishing at api-docs.invoiceshelf.com as a static
Swagger UI site.

- config/scramble.php: scope to api/v1, version from version.md, clean
  placeholder server, export to public/openapi.json
- ScrambleServiceProvider: advertise Bearer (Sanctum) auth; add the required
  `company` tenancy header only to routes using the `company` middleware
- OpenApiDocumentationTest: assert spec shape, auth scheme, company-header gating
- .github/workflows/openapi.yml: export + commit spec on release, notify the
  api-docs site to rebuild
- public/openapi.json: generated seed spec (184 paths)
- dedoc/scramble added as a dev-only dependency

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

bootstrap/providers.php

@@ -7,6 +7,7 @@ use App\Providers\DriverRegistryProvider;
 use App\Providers\DropboxServiceProvider;
 use App\Providers\PdfServiceProvider;
 use App\Providers\RouteServiceProvider;
+use App\Providers\ScrambleServiceProvider;
 use App\Providers\ViewServiceProvider;
 use App\Support\Hashids\HashidsServiceProvider;
 
@@ -20,4 +21,5 @@ return [
     DriverRegistryProvider::class,
     AiServiceProvider::class,
     AppConfigProvider::class,
+    ScrambleServiceProvider::class,
 ];