feat: add admin publishing workflow and yar theme

Add Go/Postgres admin APIs, Angular admin UI, manual build flow, asset uploads, markdown import/export, configurable slug generation, and the Yar reading theme. Exclude local docs and generated development artifacts from version control.

content/posts/linux-process-learning-2.md

@@ -0,0 +1,39 @@
+---
+id: cf7cfd71-d2ac-4f5a-a175-808ef410a339
+slug: linux-process-learning-2
+title: Linux 进程学习 二
+summary: ""
+status: published
+tags: []
+cover: ""
+version: 1
+slug_source: manual
+slug_locked: true
+published_at: "2022-10-16T16:13:33+08:00"
+created_at: "2022-10-16T16:13:33+08:00"
+updated_at: "2026-01-07T18:10:43+08:00"
+---
+
+## 创建进程
+在 Linux 中每个进程都是父进程创建的，Linux 启动时会创建init 进程，这是系统的第一个进程，其 PID 为 1。
+在 C 语言中，我们可以用fork函数创建新的进程：
+```c
+#include <unistd.h>
+pid_t fork(void);
+```
+- If fork() returns a negative value, the creation of a child process was unsuccessful.
+- fork() returns a zero to the newly created child process.
+- fork() returns a positive value, the process ID of the child process, to the parent. The returned process ID is of type pid_t defined in sys/types.h. Normally, the process ID is an integer. Moreover, a process can use function getpid() to retrieve the process ID assigned to this process.
+
+也就是：
+> On success, the PID of the child process is returned in the
+       parent, and 0 is returned in the child.  On failure, -1 is
+       returned in the parent, no child process is created, and errno is
+       set to indicate the error.
+
+也就是：
+- 返回负数，创建失败
+- 返回 0 ，就是子进程，它永远返回 0
+- 返回大于 0 的整数，这是父进程，它会返回子进程的pid
+
+## 终止进程