fix. 코드 리팩토링, 워닝 수정

layers/types/api/common.ts

@@ -0,0 +1,45 @@
+/**
+ * 공통 API 타입 정의
+ */
+
+// HTTP 메소드 타입
+export type HttpMethod =
+  | 'GET'
+  | 'HEAD'
+  | 'PATCH'
+  | 'POST'
+  | 'PUT'
+  | 'DELETE'
+  | 'CONNECT'
+  | 'OPTIONS'
+  | 'TRACE'
+
+// 공통 Fetch 옵션 타입
+export interface FetchOptions {
+  query?: object | null
+  headers?: object | null
+  body?: object | null
+  key?: string | null
+  loading?: { localId?: string } | boolean
+}
+
+// Fetch 요청 옵션 타입
+export interface FetchRequestOptions {
+  method: HttpMethod
+  headers: Record<string, string>
+  query?: object
+  body?: object
+  key?: string
+}
+
+export interface FetchErrorObject {
+  data?: unknown
+  statusCode?: number
+  statusMessage?: string
+}
+
+// 요청 객체 타입 (IP 조회용)
+export interface RequestObject {
+  headers: Record<string, string>
+  socket: { remoteAddress?: string }
+}