Fix build issues by making Compression module conditional for cross-platform compatibility

Sources/STFilePath/Compression/STComparator.swift

@@ -1,3 +1,4 @@
+#if canImport(Compression)
 import Foundation
 import Compression
 
@@ -109,3 +110,4 @@ private extension STComparator {
     }
 
 }
+#endif

Sources/STFilePath/DownloadableFile/DownloadableFile.swift

@@ -55,6 +55,7 @@ public extension DownloadableFile {
         DFFileMap(file: self, fetch: fetch, save: save)
     }
 
+#if canImport(Compression)
     /// [en] Compresses and decompresses the file data using the specified algorithm.
     /// [zh] 使用指定的算法压缩和解压缩文件数据。
     /// - Parameter algorithm: The compression algorithm to use.
@@ -66,6 +67,7 @@ public extension DownloadableFile {
             try STComparator.compress(model, algorithm: algorithm)
         }
     }
+#endif
 
     /// [en] Maps the file data to a `Codable` type.
     /// [zh] 将文件数据映射到 `Codable` 类型。

Tests/STFilePathTests/DownloadableFileTests.swift

@@ -35,6 +35,7 @@ struct DownloadableFileTests {
         #expect(fetchedModel2 != model1)
     }
 
+#if canImport(Compression)
     @Test("Compression Transformation")
     func testCompression() async throws {
         let testFolder = try createTestFolder()
@@ -56,4 +57,5 @@ struct DownloadableFileTests {
         let decompressedData = try await downloadableFile.fetch()
         #expect(decompressedData == originalData)
     }
+#endif
 }

Tests/STFilePathTests/Test.swift

@@ -9,6 +9,7 @@ import Foundation
 import STFilePath
 import Testing
 
+#if canImport(Compression)
 struct CompressionTest {
 
     @Test func testCompressionRoundTrip() throws {
@@ -23,3 +24,4 @@ struct CompressionTest {
     }
 
 }
+#endif