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/handler/routes_authenticated_core.go

@@ -14,6 +14,8 @@ func registerAuthedUserAndLicenseRoutes(authed *gin.RouterGroup, svc *service.Co
 	authed.PUT("/me/pinned-libraries", setPinnedLibrariesHandler(svc))
 	authed.POST("/me/password", changePasswordHandler(svc))
 	authed.POST("/me/logout", logoutHandler(svc))
+	authed.GET("/me/temporary-password", temporaryPasswordHandler(svc))
+	authed.POST("/me/temporary-password", temporaryPasswordHandler(svc))
 
 	authed.GET("/auth/permissions", getMyPermissionsHandler(svc))
 }