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/repository/queries/template.sql

@@ -1,6 +1,6 @@
 -- name: ListTemplates :many
 SELECT id, scope, tenant_id, origin_type, template_key, template_name,
-       schema_json, prompt_template, prompt_visibility, card_config_json,
+       prompt_template, prompt_visibility, card_config_json,
        status, version_no, created_at, updated_at
 FROM article_templates
 WHERE (scope = 'platform' OR tenant_id = sqlc.arg(tenant_id)::bigint)
@@ -9,14 +9,9 @@ ORDER BY created_at DESC;
 
 -- name: GetTemplateByID :one
 SELECT id, scope, tenant_id, origin_type, template_key, template_name,
-       schema_json, prompt_template, prompt_visibility, protected_prompt_asset_key,
+       prompt_template, prompt_visibility, protected_prompt_asset_key,
        card_config_json, status, version_no, created_at, updated_at
 FROM article_templates
 WHERE id = sqlc.arg(id)
   AND (scope = 'platform' OR tenant_id = sqlc.arg(tenant_id)::bigint)
   AND deleted_at IS NULL;
-
--- name: GetTemplateSchema :one
-SELECT id, template_name, schema_json
-FROM article_templates
-WHERE id = sqlc.arg(id) AND deleted_at IS NULL;