四期(大小屏融合)后端可代码部分：跨域解析网关/扫码验真/跨屏权益通兑

- model/rights.go: ScreenType/ParsedMA/ResolveResult/ScanVerifyResult/UserRights/PurchaseRecord/CrossScreenRightsResult
- service/phase4.go: ParseMACode + Resolve(C.1/C.2) + ScanVerify(B.2) + RecordPurchase/VerifyCrossScreenRights(D.1)
- api/handlers.go: GET /content/resolve, POST /content/scan-verify, /rights/purchase, /rights/verify
- service/phase4_test.go: 18 单测全绿
- 同一MA码跨iptv/ott/app统一解析; 任一屏购买全屏通看不重复扣费
- OTT/移动端SDK/C2PA凭证标注需外部环境
- 更新 5-task-IPTV-四期.md 进度

tcs-iptv/internal/service/service.go

@@ -57,6 +57,7 @@ type Service struct {
 	auths   map[string]model.Authorization // maCode -> 授权（F22）
 	black   map[string]bool                // maCode -> 黑名单（跨省复用校验）
 	filings map[string]model.FilingRecord  // maCode -> 备案/网标关联（三期 A.1）
+	rights  map[string]*model.UserRights   // userHash -> 跨屏权益账户（四期 D.1）
 	mu      sync.Mutex
 	seqMu   sync.Mutex
 	seqs    map[string]int // 按前缀独立计数（REV/ctid/DIST 各自从 1 递增）
@@ -87,6 +88,7 @@ func New(c chain.Client, gen *macode.Generator) *Service {
 		auths:   make(map[string]model.Authorization),
 		black:   make(map[string]bool),
 		filings: make(map[string]model.FilingRecord),
+		rights:  make(map[string]*model.UserRights),
 		seqs:    make(map[string]int), reviews: make(map[string]*reviewItem),
 	}
 }