fix: 无参数启动时可能把空指针传给 execvp

[enkilee]

问题根因： parse_args() 在末尾无条件 emplace_back(nullptr)，导致：
argc=1（无子命令）时，args = {nullptr}，args.empty() 为 false，空参检查永远不生效
args[0] 是 nullptr，传入 execvp(nullptr, ...) 是未定义行为

修复内容（2处改动）：
parse_args() (ll-init.cpp:238) — 移除末尾的 args.emplace_back(nullptr)。现在 parse_args 只返回实际的参数指针，args.empty() 能正确检测无参数的情况。
run() (ll-init.cpp:261) — 将参数类型改为 const std::vector<const char *> &（避免不必要的拷贝），并在 fork 后的子进程中构造局部的以 null 结尾的 c_args 数组传给 execvp。这与 delegate_run() 函数（第459行）的模式一致。

修复后的行为：
argc=1 → args 为空 → args.empty() 为 true → 打印 "No arguments provided" 并返回 -1
argc>1 → args 包含实际参数 → run() 中构造 null-terminated 数组 → execvp 正常执行

[deepin-ci-robot]

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[gemini-code-assist]

Code Review

This pull request refactors argument parsing and execution in ll-init.cpp by passing arguments to run by reference and constructing a null-terminated array for execvp inside the child process. The review feedback recommends preparing this null-terminated array in the parent process before calling fork() to avoid unsafe heap allocations in the child process, ensuring compliance with async-signal-safe standards.

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[reddevillg]

可以 squash 成一个 commit 吗？