feat(media-supply): persist favorites with multi-group membership

Move media favorites from client state to PostgreSQL with server-side
search and pagination.

- Store favorites keyed by (tenant, user, group, resource) so a resource
  can belong to multiple groups; the 500-resource cap counts distinct
  resources, not memberships.
- Add favorite-group CRUD and group/global removal routes, with silent
  cleanup of delisted or invisible resources on read.
- Serve favorite resource details server-side, 10 per page, with name/ID
  search; favorites-page removal is group-scoped, resources-page removal
  is global.

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

packages/shared-types/src/index.ts

@@ -604,6 +604,29 @@ export interface MediaSupplySearchOptionsResponse {
   updated_at: string
 }
 
+export interface MediaSupplyFavoriteGroupRecord {
+  id: string
+  name: string
+  resource_ids: number[]
+  updated_at: string
+}
+
+export interface MediaSupplyFavoriteGroupsResponse {
+  groups: MediaSupplyFavoriteGroupRecord[]
+  initialized: boolean
+  revision: number
+}
+
+export interface ListMediaSupplyFavoriteResourcesParams {
+  keyword?: string
+  page?: number
+}
+
+export interface CreateMediaSupplyFavoriteGroupRequest {
+  name: string
+  resource_id?: number
+}
+
 export interface CreateMediaSupplyOrderRequest {
   article_id?: number | null
   model_id: number