feat: SSHClient v1.0.0 - PyQt5 + paramiko 跨平台 SSH 客户端

功能:
- 多主机管理 (增删改查, 密码/私钥双认证, 导入导出)
- 远程终端 (命令执行 + 常用命令快捷栏 + 超时控制)
- SFTP 文件浏览 (上传/下载带进度, 新建/删除/重命名)
- 实时监控 (CPU/内存/磁盘/网络, 1-10秒可调刷新)
- AI Agent (OpenAI 兼容 API, 5 工具自动调用: 命令/指标/列文件/读文件/上传)

技术栈: PyQt5 + paramiko + psutil + requests + PyInstaller
打包: build_windows.bat / build.sh 一键产出 ~57MB 单文件 exe
测试: core 6/6 + UI 3/3 + E2E 6/6 全部通过

build.sh

@@ -0,0 +1,59 @@
+"""
+跨平台开发打包脚本（开发机/测试用）
+Linux/Mac:  ./build.sh
+Windows:    build_windows.bat
+"""
+import os
+import platform
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).parent
+
+def main():
+    os.chdir(ROOT)
+    print("=" * 50)
+    print(f"  SSHClient 打包脚本 ({platform.system()})")
+    print("=" * 50)
+
+    venv = ROOT / "venv"
+    if not venv.exists():
+        print("[1/4] 创建虚拟环境...")
+        subprocess.check_call([sys.executable, "-m", "venv", "venv"])
+    if platform.system() == "Windows":
+        py = venv / "Scripts" / "python.exe"
+    else:
+        py = venv / "bin" / "python"
+
+    print("[2/4] 安装依赖...")
+    subprocess.check_call([str(py), "-m", "pip", "install", "--upgrade", "pip"])
+    subprocess.check_call([str(py), "-m", "pip", "install", "-r", "requirements.txt"])
+
+    print("[3/4] 清理旧产物...")
+    for d in ("build", "dist"):
+        if (ROOT / d).exists():
+            shutil.rmtree(ROOT / d)
+    for f in ROOT.glob("*.spec.bak"):
+        f.unlink()
+
+    print("[4/4] 开始 PyInstaller 打包...")
+    subprocess.check_call([str(py), "-m", "PyInstaller", "build.spec", "--clean", "--noconfirm"])
+
+    exe_name = "SSHClient.exe" if platform.system() == "Windows" else "SSHClient"
+    out = ROOT / "dist" / exe_name
+    if out.exists():
+        size_mb = out.stat().st_size / 1024 / 1024
+        print()
+        print("=" * 50)
+        print(f"  ✓ 打包完成: {out}")
+        print(f"  ✓ 大小: {size_mb:.1f} MB")
+        print("=" * 50)
+    else:
+        print("[X] 打包未产出文件，请检查 PyInstaller 输出")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()