实时歌词推送（指定播放器）

Server-Sent Events 实时歌词推送（指定播放器）。
Per-player 端点始终推送指定播放器的歌词事件，不受路由切换影响。

连接建立时： 若已缓存该播放器的 lyric_update 则立即补发一条，否则不发送（第一条等到实际有歌词时才到达，不发 data:{}）。

事件格式（含逐字 text_detailed；无逐字的行该字段为 {}）：

data: {"type":"lyric_update","player":"cloudmusicv3","data":{"index":37,"text":"There's plenty of time to sleep when we die","sub_text":"死后自会长眠。","roma_text":"","timestamp":157.22,"play_time":156.46,"position":156.4659,"progress":0.62976056,"text_detailed":{"timestamp":156.96,"play_time":156.46,"duration":7.02,"words":[{"timestamp":156.96,"play_time":156.46,"duration":0.18,"text":"There's "},{"timestamp":157.14,"play_time":156.64,"duration":0.57,"text":"plenty "}]}}}

约束：

载荷与 WebSocket 逐字节同构（含 type 字段）

连接建立时，若已有缓存则补发一条当前状态；无缓存则不发送（不发 data:{}）

响应头包含 Access-Control-Allow-Origin: *

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text/event-stream

SSE 事件流

Bodytext/event-stream

示例

有歌词时（含逐字 text_detailed；无逐字的行该字段为 {}）无歌词时

data: {"type":"lyric_update","player":"cloudmusicv3","data":{"index":37,"text":"There's plenty of time to sleep when we die","sub_text":"死后自会长眠。","roma_text":"","timestamp":157.22,"play_time":156.46,"position":156.4659,"progress":0.62976056,"text_detailed":{"timestamp":156.96,"play_time":156.46,"duration":7.02,"words":[{"timestamp":156.96,"play_time":156.46,"duration":0.18,"text":"There's "},{"timestamp":157.14,"play_time":156.64,"duration":0.57,"text":"plenty "}]}}}

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