feat: study modes (fast/parallel) and course-container completion fix

- settings: study.mode fast|normal and study.parallel 1-5

- normal mode: one headless browser per video, visibility keep-alive, auto-degrade when the platform enforces order

- report study/log/detail/save before isComplete; drop lastProgressTime on completion

- complete periodType 10/13 container nodes and recompute counters via PUT calFinalScore

- capture mode: POST /api/capture records all XHR/fetch including new tabs

- UI: study mode in settings, capture / stop-capture menu items

Dockerfile

@@ -0,0 +1,43 @@
+# 多账号学习控制台 —— 运行镜像
+# 构建:   docker build -t study-tool:latest .
+# 瘦身:   docker build --build-arg WITH_PLAYWRIGHT=0 -t study-tool:latest .   （不要直链视频播放）
+FROM python:3.12-slim-bookworm
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    DEBIAN_FRONTEND=noninteractive \
+    TZ=Asia/Shanghai \
+    HOST=0.0.0.0 \
+    PORT=8848 \
+    DATA_DIR=/app/data \
+    DB_PATH=/app/data/study.db \
+    PLAYWRIGHT_BROWSERS_PATH=/ms-playwright
+
+WORKDIR /app
+
+# nodejs: desenc.js 要用（登录表单 rsa 字段走站点原版 DES 算法）
+# curl:   健康检查用
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends nodejs ca-certificates curl tzdata \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt ./
+RUN pip install -r requirements.txt
+
+# 直链视频（fileType=other）必须用真浏览器播到结尾；不需要就 WITH_PLAYWRIGHT=0
+ARG WITH_PLAYWRIGHT=1
+RUN if [ "$WITH_PLAYWRIGHT" = "1" ]; then \
+        playwright install --with-deps chromium && rm -rf /var/lib/apt/lists/* ; \
+    fi
+
+COPY . .
+RUN mkdir -p /app/data
+
+EXPOSE 8848
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+  CMD curl -fsS "http://127.0.0.1:${PORT}/api/health" || exit 1
+
+CMD ["python", "app.py"]