重构项目，现支持多线程操作

src/main.cpp

@@ -0,0 +1,87 @@
+#include "expkg.h"
+
+#include <iomanip>
+#include <iostream>
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        std::cout << "Usage: expkg path/to/file.pkg|file.tex [output_dir]" << std::endl;
+        return 0;
+    }
+
+    std::filesystem::path inputPath = argv[1];
+    std::filesystem::path outDir = argc >= 3 ? argv[2] : "out";
+
+    PKG::ExtractPipeline pipeline;
+    PKG::ExtractStats stats;
+    auto result = pipeline.Run(inputPath, outDir, /*showProgress=*/true, &stats);
+
+    std::cout << std::endl; // 进度条换行后空一行
+
+    size_t total = stats.totalEntries.load();
+    size_t ok = stats.succeeded.load();
+    size_t fail = stats.failed.load();
+    uint64_t outBytes = stats.totalOutputBytes.load();
+
+    // 完全失败（没有任何条目被处理）：只打印错误，不显示统计面板
+    if (!result && ok == 0 && fail == 0) {
+        std::cerr << "错误: " << result.error.message << std::endl;
+        return 1;
+    }
+
+    // 成功或部分成功：打印结果与统计
+    if (result)
+        std::cout << "提取完成" << std::endl;
+    else
+        std::cerr << "错误: " << result.error.message << std::endl;
+
+    double elapsed = stats.ElapsedSeconds();
+
+    std::cout << "──────────────────────────────" << std::endl;
+
+    // 文件总数
+    std::cout << "文件总数:  " << ok << " 个";
+    if (fail > 0)
+        std::cout << " (失败 " << fail << " 个)";
+    if (total > ok + fail)
+        std::cout << " / 共 " << total << " 个";
+    std::cout << std::endl;
+
+    // 输出大小
+    std::cout << "输出大小:  " << PKG::FormatBytes(outBytes) << std::endl;
+
+    // 耗时与吞吐（仅在时间有效时打印）
+    if (elapsed >= 0) {
+        std::cout << "耗时:      " << std::fixed << std::setprecision(2) << elapsed << " 秒";
+        if (elapsed > 0 && ok > 0)
+            std::cout << " (" << std::setprecision(1) << (ok / elapsed) << " 个/秒)";
+        std::cout << std::endl;
+    }
+
+    // 输入 → 输出对比（仅在输入大小有效时打印）
+    if (stats.inputFileSize > 0 && stats.inputFileSize < 1ULL << 40) {
+        std::cout << "输入文件:  " << PKG::FormatBytes(stats.inputFileSize);
+        if (outBytes > 0) {
+            double ratio = static_cast<double>(outBytes) / stats.inputFileSize;
+            std::cout << " → 输出 " << PKG::FormatBytes(outBytes)
+                      << " (×" << std::setprecision(2) << ratio << ")";
+        }
+        std::cout << std::endl;
+    }
+
+    // 各格式分布
+    if (!stats.formatCounts.empty()) {
+        std::cout << "格式分布:" << std::endl;
+        for (const auto &[ext, count] : stats.formatCounts)
+            std::cout << "  ." << ext << "  " << count << " 个" << std::endl;
+    }
+
+    // 内存占用（峰值）
+    size_t peakRss = PKG::GetPeakRssBytes();
+    if (peakRss > 0)
+        std::cout << "内存占用:  " << PKG::FormatBytes(peakRss) << " (峰值)" << std::endl;
+
+    std::cout << "──────────────────────────────" << std::endl;
+
+    return result ? 0 : 1;
+}