feat: support apk

internal/hubmodule/apk/module.go

@@ -0,0 +1,29 @@
+// Package apk registers metadata for Alpine APK proxying.
+package apk
+
+import (
+	"time"
+
+	"github.com/any-hub/any-hub/internal/hubmodule"
+)
+
+const apkDefaultTTL = 6 * time.Hour
+
+func init() {
+	// 模块元数据声明，具体 hooks 见 hooks.go（已在 init 自动注册）。
+	hubmodule.MustRegister(hubmodule.ModuleMetadata{
+		Key:            "apk",
+		Description:    "Alpine APK proxy with cached indexes and packages",
+		MigrationState: hubmodule.MigrationStateBeta,
+		SupportedProtocols: []string{
+			"apk",
+		},
+		CacheStrategy: hubmodule.CacheStrategyProfile{
+			TTLHint:                0,                                    // APKINDEX 每次再验证，包体直接命中
+			ValidationMode:         hubmodule.ValidationModeLastModified, // APKINDEX 再验证
+			DiskLayout:             "raw_path",
+			RequiresMetadataFile:   false,
+			SupportsStreamingWrite: true, // 包体流式写
+		},
+	})
+}