feat: Refactor template handling and brand management

- Removed schema_json from article templates and related queries.
- Updated brand service to include website field in requests and responses.
- Simplified template wizard view by eliminating unused schema fields and related logic.
- Added tests for ark text format handling.
- Created migrations for dropping schema_json and adding website to brands.

server/internal/tenant/domain/article_template.go

@@ -9,7 +9,6 @@ type ArticleTemplate struct {
 	OriginType              string
 	TemplateKey             string
 	TemplateName            string
-	SchemaJSON              map[string]interface{}
 	PromptTemplate          *string
 	PromptVisibility        string
 	ProtectedPromptAssetKey *string