feat: 支持临时登录密码并完善 Emby 媒体详情兼容

- 新增 6 位临时密码生成与验证接口，支持 TV 及客户端快速登录
- 媒体及剧集详情补充 People 演职员信息解析与返回
- 优化剧集背景图与海报标签继承机制及播放时长兜底逻辑
- 增加临时密码登录相关的单元测试

internal/service/emby_series_payload.go

@@ -27,16 +27,20 @@ func (e *EmbyService) seriesPayload(group embySeriesGroup) map[string]any {
 			"CommunityRating":    group.Rating,
 			"RecursiveItemCount": len(group.Episodes),
 			"ChildCount":         len(e.seasonsForSeries(group)),
-			"DateCreated":        group.CreatedAt,
-			"DateLastMediaAdded": lastMediaAdded,
-			"ImageTags":          imageTags,
-			"BackdropImageTags":  backdropTags,
+		"DateCreated":        group.CreatedAt,
+		"DateLastMediaAdded": lastMediaAdded,
+		"ImageTags":          imageTags,
+		"BackdropImageTags":  backdropTags,
+		"People":             []map[string]any{},
 		"ProviderIds": map[string]string{
 			"Tmdb":    intToStr(group.TMDbID),
 			"Bangumi": intToStr(group.BangumiID),
 		},
 		"UserData": emptyUserData(),
 	}
+	if group.PosterURL != "" {
+		item["PrimaryImageTag"] = group.ID
+	}
 	if premiered, ok := embyPremiereDate(group.ReleaseDate); ok {
 		item["PremiereDate"] = premiered
 	}
@@ -53,7 +57,7 @@ func (e *EmbyService) seasonPayload(season embySeasonGroup) map[string]any {
 	if season.Series.BackdropURL != "" {
 		backdropTags = append(backdropTags, season.ID+"-bd")
 	}
-	return map[string]any{
+	item := map[string]any{
 		"Id":                season.ID,
 		"Name":              season.Name,
 		"ServerId":          embyServerID,
@@ -67,6 +71,16 @@ func (e *EmbyService) seasonPayload(season embySeasonGroup) map[string]any {
 		"ChildCount":        len(season.Episodes),
 		"ImageTags":         imageTags,
 		"BackdropImageTags": backdropTags,
+		"People":            []map[string]any{},
 		"UserData":          emptyUserData(),
 	}
+	if season.Series.PosterURL != "" {
+		item["PrimaryImageTag"] = season.ID
+		item["SeriesPrimaryImageTag"] = season.Series.ID
+	}
+	if season.Series.BackdropURL != "" {
+		item["ParentBackdropItemId"] = season.Series.ID
+		item["ParentBackdropImageTags"] = []string{season.Series.ID + "-bd"}
+	}
+	return item
 }