Sports Data

Fixed: Related entities of an overridden entity all showed as "Unknown entity". A link is now resolved from the global catalogue whenever the client's own overlay cannot answer for it, including when that overlay does not exist yet
Fixed: Save could stay disabled with nothing on screen explaining why. Validation errors an entity was already stored with are now shown as soon as it opens, and the section rail marks the section holding them
Fixed: An entity stored without a popularity could not be saved at all. It now opens with a default of 80, which reads as an unsaved change, and a newly created override is written with one
Fixed: A season could be saved without an ID, leaving a season nothing could resolve back to a competition. A season ID is now required, and the field explains how to build one
Fixed: An uploaded image could appear broken after saving. The preview now uses the address the upload itself returns, and an image the editor cannot load says so instead of showing a broken-image icon
Plainer wording in the Assets section describing how an image is stored and what apps receive

Initial Release:
- Browse the global sport catalogue across seven entity types, with search, sport filter and pagination
- Create and edit entities, with per-type sections for translations, assets, branding, socials, related entities, season history, additional information and provider references
- Client overrides: create one from a row or several at once, see which fields differ from the global entity, and remove an override to fall back
- "How people find this entity" panel explaining name matching, variations, filterable links and popularity ranking
- Read-only JSON preview of the entity data being saved
- Role-aware UI for platform_operator and client_admin