feat: 위키 저장소 초기 커밋

- CLAUDE.md 운영 규칙
- wiki/ 정리된 지식 페이지 (Nuxt + Claude Code)
- raw/ 원본 자료
- reference/ Nuxt 4.x 공식 문서

Co-authored-by: Cursor <cursoragent@cursor.com>

reference/4.api/2.composables/use-app-config.md

@@ -0,0 +1,19 @@
+---
+title: 'useAppConfig'
+description: 'Access the reactive app config defined in the project.'
+links:
+  - label: Source
+    icon: i-simple-icons-github
+    to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/config.ts
+    size: xs
+---
+
+## Usage
+
+```ts
+const appConfig = useAppConfig()
+
+console.log(appConfig)
+```
+
+:read-more{to="/docs/4.x/directory-structure/app/app-config"}