feat: record anonymous download type events

docker-compose.yml

@@ -5,7 +5,7 @@ services:
     build:
       context: .
       args:
-        VERSION: v2026.08.26-r6
+        VERSION: v2026.08.27-r7
     restart: unless-stopped
     ports:
       - "127.0.0.1:8083:8080"

web/app.js

@@ -5,6 +5,16 @@ const results = document.querySelector('#results');
 const modeNote = document.querySelector('#mode-note');
 const localDownloads = document.querySelector('#local-downloads');
 const lyricCache = new Map();
+let publicMode = false;
+
+const downloadEvents = {
+  lrc: 'original-lrc',
+  txt: 'original-txt',
+  transLRC: 'translation-lrc',
+  transTXT: 'translation-txt',
+  romaLRC: 'sound-lrc',
+  romaTXT: 'sound-txt'
+};
 
 function text(value) { return document.createTextNode(value ?? ''); }
 function hasText(value) { return typeof value === 'string' && value.trim().length > 0; }
@@ -26,6 +36,7 @@ async function loadInfo() {
     if (info.mode === 'local') {
       modeNote.textContent = '本机模式：查询从这台电脑直接发出，不经过 lrc.flechazo.xin。';
     } else {
+      publicMode = true;
       modeNote.textContent = '网页模式：查询由本站后端转发，但不会写入数据库或日志正文。下载文件在浏览器中生成。';
       localDownloads.hidden = false;
     }
@@ -46,6 +57,12 @@ function download(name, body, type = 'text/plain;charset=utf-8') {
   setTimeout(() => URL.revokeObjectURL(url), 1500);
 }
 
+function recordDownload(kind) {
+  const event = downloadEvents[kind];
+  if (!publicMode || !event) return;
+  fetch(`/api/events/download/${event}`, {method: 'POST', keepalive: true}).catch(() => {});
+}
+
 function parseLRC(lrc) {
   const lines = [];
   for (const raw of (lrc || '').split(/\r?\n/)) {
@@ -129,6 +146,7 @@ function saveLyrics(song, data, kind) {
   const selected = variants[kind];
   if (!selected || !hasText(selected[1])) throw new Error('这首歌没有对应歌词');
   download(selected[0], selected[1]);
+  recordDownload(kind);
 }
 
 function populatePreview(select, output, data) {