chore: revert OrganizationConfig defaults schema — internal field, not public API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: prithipalpatwal

docs/openapi/schemas.yaml

@@ -370,20 +370,6 @@ CdnLogsConfig:
 OrganizationConfig:
   allOf:
     - $ref: '#/Config'
-    - type: object
-      properties:
-        defaults:
-          description: >
-            Optional. Per-product default site overrides. Keys are product codes
-            (e.g. "ASO"). Each entry pins a preferred site for resolveSite so
-            customers are not subject to insertion-order dependence.
-          type: object
-          additionalProperties:
-            type: object
-            properties:
-              siteId:
-                description: The ID of the default site for this product. Set to null to clear.
-                $ref: '#/Id'
 SiteConfig:
   allOf:
     - $ref: '#/Config'