feat(hooks): pass container state to hooks over stdin

Complete the OCI hooks state-passing logic and fix several bugs:

- Pass container state JSON to hooks over stdin as required by OCI spec
- Fix socketpair created after fork (child had no socket)
- Fix env variable concatenation bug ('+' was pointer arithmetic)
- Fix waitpid EINTR/EAGAIN condition (&& should be ||)
- Add hook timeout support via sigtimedwait
- Fix poststop_hooks iterating over wrong hook list (poststart)
- Update all hook call sites to pass container_status_t

Also adapt to the new socket API:

- Replace unixSocketClient with unix_socket
- Use unix_socket::pair() instead of utils::socketpair()
- Use STDIN_FILENO/STDOUT_FILENO instead of utils::fileno()
- Update SPDX copyright years to 2026

Signed-off-by: ComixHe <ComixHe1895@outlook.com>

Author: ComixHe

src/linyaps_box/command/exec.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2022-2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2022-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -25,11 +25,11 @@ auto linyaps_box::command::exec(const struct exec_options &options) -> int
     option.proc.args = options.command;
     option.proc.terminal = options.tty;
     option.proc.no_new_privileges = options.no_new_privs;
-    option.proc.env = options.envs.value_or(std::vector<std::string>{});
+    option.proc.env = options.envs.value_or(std::vector<std::string>{ });
     option.preserve_fds = options.preserve_fds;
 
     if (option.proc.terminal && options.console_socket) {
-        option.console_socket = unixSocketClient::connect(options.console_socket.value());
+        option.console_socket = unix_socket::connect(options.console_socket.value());
     }
 
 #ifdef LINYAPS_BOX_ENABLE_CAP

src/linyaps_box/command/run.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2022-2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2022-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -23,7 +23,7 @@ auto linyaps_box::command::run(const struct run_options &options) -> int
     run_options.preserve_fds = options.preserve_fds;
 
     if (container.get_config().process.terminal && options.console_socket) {
-        run_options.console_socket = unixSocketClient::connect(options.console_socket.value());
+        run_options.console_socket = unix_socket::connect(options.console_socket.value());
     }
 
     return container.run(std::move(run_options));