feat: improve replay workflow and viewer UI

Co-Authored-By: Claude Fable 5 <[email protected]>

frontend/src/api/streams.ts

@@ -27,6 +27,7 @@ export interface StreamInfo {
   multicast_enabled: boolean
   created_at: string
   replay_file?: string
+  replay_url?: string
   chapters: Chapter[]
   transcode_profile: string
   renditions?: RenditionConfig[] | null
@@ -44,7 +45,8 @@ export interface StreamCreateReq {
   description?: string
   cover_url?: string
   scheduled_at?: string
-  replay_file?: string
+  replay_file?: string | null
+  replay_url?: string | null
   chapters?: Chapter[]
   transcode_profile?: string
   renditions?: RenditionConfig[]
@@ -63,6 +65,7 @@ export interface WatchInfo {
   description?: string
   scheduled_at?: string
   replay_url?: string
+  replay_local_url?: string
   chapters: Chapter[]
   remote_control_enabled: boolean
 }