feat: add relay_play_state_submit API for song play state tracking

- Add new interface /api/relay/play/state/submit
- Support sessionId tracking for play sessions
- Support playMode parameter (list_loop, single_loop, random, single)
- Add parameter validation
- Include integration documentation

module/relay_play_state_submit.js

@@ -0,0 +1,32 @@
+// 提交歌曲播放状态
+
+const createOption = require('../util/option.js')
+module.exports = (query, request) => {
+  const { id, sessionId, progress = 0, playMode = 'list_loop', type = 'song' } = query
+
+  if (!id || !sessionId) {
+    return Promise.reject({
+      status: 400,
+      body: {
+        code: 400,
+        msg: '缺少必要参数：id, sessionId',
+      },
+    })
+  }
+
+  const playStateSubmitReq = JSON.stringify({
+    resource: {
+      id: String(id),
+      type: type
+    },
+    progress: progress,
+    sessionId: sessionId,
+    playMode: playMode
+  })
+
+  const data = {
+    playStateSubmitReq: playStateSubmitReq
+  }
+
+  return request('/api/relay/play/state/submit', data, createOption(query, 'weapi'))
+}