docs(openspec): propose 8 tigshop migration changes (P0-P7) + migration plan

openspec/changes/add-product-reviews/specs/frontend-admin/spec.md

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+## ADDED Requirements
+
+### Requirement: Platform review moderation
+Platform admins SHALL review a paginated moderation list of all reviews with their product, customer, and shop context and SHALL hide or delete reviews through the shared API contract. Admin SHALL expose review moderation navigation beside existing platform operations.
+
+#### Scenario: hide a review from the moderation list
+- **WHEN** a platform admin hides a review
+- **THEN** the list shows it as hidden and the review leaves the mall storefront and rating summary
+
+#### Scenario: delete a review
+- **WHEN** a platform admin deletes a review
+- **THEN** the row is removed and absent from both admin and storefront listings
+
+#### Scenario: moderation appears in admin navigation
+- **WHEN** an authenticated platform admin opens the admin console
+- **THEN** a review moderation entry is reachable from the console nav