feat: add Kbd component and blog post about IDEA schema validation bug

Add a Kbd component with macOS special key support (⌘, ⌥, ⌃, ⇧, etc.),
export it from theme/index.tsx for use in MDX files.

Add blog posts (EN + ZH) documenting the IntelliJ IDEA application.yaml
schema validation bug caused by an overly broad fileMatch pattern in
SchemaStore, along with the quick fix.

theme/index.tsx

@@ -26,3 +26,4 @@ function DocLayout(props: DocLayoutProps) {
 
 export * from "@rspress/core/theme-original"
 export { DocLayout }
+export { Kbd } from "./components/Kbd"