feat(media-supply): resource cache sync and order flow refinements

Add a resource cache sync entrypoint (RunMediaResourceSyncOnce) driven
by the new scheduler job, and rework the backlink/sync worker around it.
Tune the meijiequan client and slow the default backlink sync interval
from 10m to 30m to reduce upstream pressure.

Trim unused public/transport surface (handler + router + swagger) and
simplify admin-web order management and ops-web media-supply views,
dropping stale shared-types fields.

server/internal/shared/swagger/descriptions.go

@@ -214,7 +214,6 @@ var routeDocs = map[string]routeDoc{
 	"POST /api/tenant/media-supply/orders":                  {"创建媒介投放订单", "为选定媒介资源创建投放订单。"},
 	"GET /api/tenant/media-supply/orders":                   {"媒介订单列表", "分页查询当前 Workspace 的媒介投放订单。"},
 	"GET /api/tenant/media-supply/orders/:id":               {"媒介订单详情", "读取指定媒介投放订单详情。"},
-	"POST /api/tenant/media-supply/orders/sync-backlinks":   {"同步媒介订单链接", "从供应商侧同步媒介订单的发布链接。"},
 	"GET /api/tenant/media-supply/wallet":                   {"媒介钱包状态", "读取当前 Workspace 的媒介供应钱包余额与状态。"},
 	"GET /api/tenant/media-supply/wallet/ledgers":           {"媒介钱包流水", "分页查询媒介供应钱包收支流水。"},
 	"POST /api/tenant/media-supply/wallet/adjustments":      {"调整媒介钱包", "创建媒介钱包余额调整记录。"},