ops: 新增 course-toolkit（YouTube 课程下载+转写+成册工具，含踩坑记录）

ops/course-toolkit/worker.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# worker.sh — 处理单个视频：下载 → 抽音频 → 转写（由 fetch_course.sh 调用）
+set -uo pipefail
+HERE="$(cd "$(dirname "$0")" && pwd)"
+line="$1"
+NN=$(echo "$line"|cut -d'|' -f1); ID=$(echo "$line"|cut -d'|' -f2); SLUG=$(echo "$line"|cut -d'|' -f3)
+VID="$OUT/videos/${NN}-${SLUG}.mp4"; TXT="$OUT/transcripts/${NN}-${SLUG}.${LANG}.txt"
+LOG="$OUT/build.log"
+log(){ echo "[$(date '+%F %T')] [$NN] $*" >> "$LOG"; }
+[ -f "$TXT" ] && { log "skip(done)"; exit 0; }
+if [ ! -f "$VID" ]; then
+  for a in 1 2 3; do
+    yt-dlp --proxy "$PROXY" --no-warnings --no-part \
+      --extractor-args "youtube:player_client=android" -f "$FMT" \
+      -o "$VID" "https://www.youtube.com/watch?v=$ID" >>"$LOG" 2>&1 && break
+    log "retry-dl $a"; sleep 8
+  done
+fi
+[ -f "$VID" ] || { log "FAIL download"; exit 1; }
+ffmpeg -y -hide_banner -loglevel error -i "$VID" -ar 16000 -ac 1 -c:a pcm_s16le "$OUT/_${NN}.wav" 2>>"$LOG" || { log "FAIL audio"; exit 1; }
+MODEL="$MODEL" LANG="$LANG" THREADS=1 python3 "$HERE/course_util.py" transcribe "$OUT/_${NN}.wav" "$TXT" >>"$LOG" 2>&1 || { log "FAIL transcribe"; exit 1; }
+rm -f "$OUT/_${NN}.wav"
+log "ok $(du -h "$VID"|cut -f1)"