fix: portable 绿色单机版 SSH 连接 + 主机数据 + 打包体积

SSH 连接修复：
- main.cjs 顶部在所有 ssh2 require 之前安装 boringSslDhCompat 补丁
- 5 条 SSH 连接路径统一 legacyAlgorithms 默认值为 true

portable 版主机数据修复：
- main.cjs portable 模式设置 NETCATTY_PORTABLE=1
- preload.cjs 暴露 window.netcatty.isPortable
- useVaultState portable 模式跳过 safeStorage DPAPI 加密的 hosts_v1
- inspection saveVaultHosts handler 补 legacyAlgorithms/tags/os 字段映射

打包体积修复：
- 恢复 electron-builder.config.cjs 原始 40+ 条排除规则
- package.json 加 pend 运行时依赖

electron/bridges/sshBridge/execCommand.cjs

@@ -135,7 +135,7 @@ function createExecCommandApi(ctx) {
           // KEX / cipher / host-key set as the interactive terminal. Without
           // this, a host that needs the ECDSA skip or legacy algorithms would
           // connect in the terminal but still fail the same handshake here.
-          algorithms: buildAlgorithms(payload.legacyAlgorithms, {
+          algorithms: buildAlgorithms(payload.legacyAlgorithms !== false, {
             skipEcdsaHostKey: payload.skipEcdsaHostKey,
             algorithmOverrides: payload.algorithmOverrides,
           }),