chore: 更新网站域名和背景图片配置

将网站域名从 blog.acofork.com 更改为 blog.meowrain.cn
修改背景图片源为新的随机图片API，并保留旧配置作为注释

astro.config.mjs

@@ -36,7 +36,7 @@ export default defineConfig({
   image: {
     service: passthroughImageService(),
   },
-  site: "https://blog.acofork.com",
+  site: "https://blog.meowrain.cn",
   base: "/",
   trailingSlash: "always",
   output: "static",

src/config.ts

@@ -35,7 +35,8 @@ export const siteConfig: SiteConfig = {
   },
   background: {
     enable: true, // Enable background image
-    src: "https://t.alcy.cc/ycy", // Background image URL (supports HTTPS)
+    src: "https://riscv-nas.acetaffy.top/random?type=horizontal",
+    // src: "https://t.alcy.cc/ycy", // Background image URL (supports HTTPS)
     position: "center", // Background position: 'top', 'center', 'bottom'
     size: "cover", // Background size: 'cover', 'contain', 'auto'
     repeat: "no-repeat", // Background repeat: 'no-repeat', 'repeat', 'repeat-x', 'repeat-y'