[Refactor/OPS-246] 다건 삭제 DELETE 본문 수정

src/main/java/org/tuna/zoopzoop/backend/domain/datasource/controller/DataSourceController.java

@@ -66,7 +66,7 @@ public ResponseEntity<RsData<Map<String, Integer>>> delete(
 
     // ===== 다건 삭제 =====
     @Operation(summary = "자료 다건 삭제", description = "내 PersonalArchive 안에 자료를 다건 삭제합니다.")
-    @PostMapping("/delete")
+    @DeleteMapping("/delete")
     public ResponseEntity<RsData<Void>> deleteMany(
             @Valid @RequestBody reqBodyForDeleteMany rq,
             @AuthenticationPrincipal CustomUserDetails user

src/main/java/org/tuna/zoopzoop/backend/domain/space/archive/controller/SpaceArchiveDataSourceController.java

@@ -44,7 +44,7 @@ public ResponseEntity<RsData<Map<String, Integer>>> deleteOne(
     }
 
     @Operation(summary = "공유 자료 다건 삭제")
-    @PostMapping("/delete")
+    @DeleteMapping("/delete")
     public ResponseEntity<RsData<Void>> deleteMany(
             @PathVariable String spaceId,
             @RequestBody @Valid reqBodyForDeleteMany rq,