移除 Docker 构建路线，改为 host 直装 Qt 5.14.2 + Qt Creator 4.11.0

学生主要用 Windows，Docker 方案不再需要：删掉 tools/docker/ 及 README/HANDOFF/
CMakeLists 里的相关引用（含一处已失效的 docker_run.sh 死链接）。

install_qt_host.sh 现在同时装期号匹配的 Qt Creator 4.11.0：官方 .run 安装器
强制要求 Qt 账号登录且无 Skip 选项，改用 tools/extract_qtcreator_payload.py
直接从 .run 里定位、解出内嵌的 7z payload，绕开账号登录。提取逻辑先解到
staging 目录再原子替换到位，避免中途失败留下部分安装但被判定为"已装"；
候选 7z 复用同一临时文件，不会在磁盘上堆多份安装包大小的临时拷贝。

tools/install_qt_host.sh

@@ -1,22 +1,26 @@
 #!/usr/bin/env bash
-# Install the ISOLATED Qt 5.14.2 toolchain into .qt514/ DIRECTLY ON THE HOST
-# (no Docker), using a local venv for aqtinstall. The host already has the right
-# toolchain (gcc 13.3, cmake 3.28); this just fetches Qt files into the repo.
+# Install the ISOLATED Qt 5.14.2 toolchain + matching Qt Creator into .qt514/
+# directly on the host, using a local venv for aqtinstall. The host already
+# has the right toolchain (gcc 13.3, cmake 3.28); this just fetches files
+# into the repo. No container involved (students are mostly on Windows).
 #
 #   Usage: tools/install_qt_host.sh
-# Prefer this over docker_install_qt.sh when you don't need a container.
 # Verified: a binary built against .qt514/ links ONLY to .qt514/ (ldd shows 0
 # system-Qt refs) and runs on the host with tools/run_qt.sh.
 set -euo pipefail
 REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 VENV="$REPO_ROOT/.venv-aqt"
 QT_VERSION="5.14.2"
+CREATOR_VERSION="4.11.0"
+CREATOR_DIR="$REPO_ROOT/.qt514/Tools/QtCreator"
+CREATOR_URL="https://download.qt.io/archive/qtcreator/${CREATOR_VERSION%.*}/${CREATOR_VERSION}/qt-creator-opensource-linux-x86_64-${CREATOR_VERSION}.run"
 
 if [ ! -x "$VENV/bin/aqt" ]; then
     echo ">> Creating local venv with aqtinstall at $VENV ..."
     python3 -m venv "$VENV" --system-site-packages
     "$VENV/bin/pip" install --quiet aqtinstall
 fi
+"$VENV/bin/pip" show py7zr >/dev/null 2>&1 || "$VENV/bin/pip" install --quiet py7zr
 
 echo ">> Installing Qt ${QT_VERSION} gcc_64 into $REPO_ROOT/.qt514/ ..."
 "$VENV/bin/aqt" install-qt linux desktop "${QT_VERSION}" gcc_64 -O "$REPO_ROOT/.qt514"
@@ -25,5 +29,26 @@ QT_ROOT="$REPO_ROOT/.qt514/${QT_VERSION}/gcc_64"
 echo ">> Verify:"
 "$QT_ROOT/bin/qmake" -query QT_VERSION
 echo ">> Qt installed at: $QT_ROOT"
-echo ">> Build on host:   cmake -S . -B build -G Ninja -DBUILD_QT_PART=ON -DCMAKE_PREFIX_PATH='$QT_ROOT' && cmake --build build"
-echo ">> Run Qt targets:  tools/run_qt.sh <target>"
+
+# Qt Creator ${CREATOR_VERSION} (period-matched to Qt ${QT_VERSION}). The official
+# .run installer for this vintage hard-gates its wizard behind a mandatory Qt
+# account login with no Skip option, so we pull the .run and lift its embedded
+# payload directly instead of driving the GUI. See tools/extract_qtcreator_payload.py.
+if [ -x "$CREATOR_DIR/bin/qtcreator" ]; then
+    echo ">> Qt Creator already installed at $CREATOR_DIR, skipping."
+else
+    echo ">> Downloading Qt Creator ${CREATOR_VERSION} .run installer ..."
+    CREATOR_RUN="$(mktemp -t qtcreator-XXXXXX.run)"
+    trap 'rm -f "$CREATOR_RUN"' EXIT
+    curl -sL -o "$CREATOR_RUN" "$CREATOR_URL"
+    echo ">> Extracting Qt Creator payload (bypassing account-gated GUI) ..."
+    "$VENV/bin/python3" "$REPO_ROOT/tools/extract_qtcreator_payload.py" "$CREATOR_RUN" "$CREATOR_DIR"
+    rm -f "$CREATOR_RUN"
+    trap - EXIT
+fi
+echo ">> Qt Creator installed at: $CREATOR_DIR"
+"$CREATOR_DIR/bin/qtcreator" -version 2>&1 | grep "^Qt Creator" || true
+
+echo ">> Build on host:    cmake -S . -B build -G Ninja -DBUILD_QT_PART=ON -DCMAKE_PREFIX_PATH='$QT_ROOT' && cmake --build build"
+echo ">> Run Qt targets:   tools/run_qt.sh <target>"
+echo ">> Open Qt Creator:  tools/run_qtcreator.sh"