feat(Go_Updater): 添加全新 Go 语言实现的自动更新器

- 新增多个源文件和目录，包括 app.rc、assets、build 脚本等
- 实现了与 MirrorChyan API 交互的客户端逻辑
- 添加了版本检查、更新检测和下载 URL 生成等功能
- 嵌入了配置模板和资源文件系统
- 提供了完整的构建和发布流程

Go_Updater/assets/assets_test.go

@@ -0,0 +1,100 @@
+package assets
+
+import (
+	"testing"
+)
+
+func TestGetConfigTemplate(t *testing.T) {
+	data, err := GetConfigTemplate()
+	if err != nil {
+		t.Fatalf("Failed to get config template: %v", err)
+	}
+
+	if len(data) == 0 {
+		t.Fatal("Config template is empty")
+	}
+
+	// Check that it contains expected content
+	content := string(data)
+	if !contains(content, "resource_id") {
+		t.Error("Config template should contain 'resource_id'")
+	}
+
+	if !contains(content, "current_version") {
+		t.Error("Config template should contain 'current_version'")
+	}
+
+	if !contains(content, "user_agent") {
+		t.Error("Config template should contain 'user_agent'")
+	}
+}
+
+func TestListAssets(t *testing.T) {
+	assets, err := ListAssets()
+	if err != nil {
+		t.Fatalf("Failed to list assets: %v", err)
+	}
+
+	if len(assets) == 0 {
+		t.Fatal("No assets found")
+	}
+
+	// Check that config template is in the list
+	found := false
+	for _, asset := range assets {
+		if asset == "config_template.yaml" {
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		t.Error("config_template.yaml should be in the assets list")
+	}
+}
+
+func TestGetAssetFS(t *testing.T) {
+	fs := GetAssetFS()
+	if fs == nil {
+		t.Fatal("Asset filesystem should not be nil")
+	}
+
+	// Try to open the config template
+	file, err := fs.Open("config_template.yaml")
+	if err != nil {
+		t.Fatalf("Failed to open config template from filesystem: %v", err)
+	}
+	defer file.Close()
+
+	// Check that we can read from it
+	buffer := make([]byte, 100)
+	n, err := file.Read(buffer)
+	if err != nil && err.Error() != "EOF" {
+		t.Fatalf("Failed to read from config template: %v", err)
+	}
+
+	if n == 0 {
+		t.Fatal("Config template appears to be empty")
+	}
+}
+
+// Helper function to check if string contains substring
+func contains(s, substr string) bool {
+	return len(s) >= len(substr) && (s == substr || len(substr) == 0 ||
+		(len(s) > len(substr) && (s[:len(substr)] == substr ||
+			s[len(s)-len(substr):] == substr ||
+			containsAt(s, substr, 1))))
+}
+
+func containsAt(s, substr string, start int) bool {
+	if start >= len(s) {
+		return false
+	}
+	if start+len(substr) > len(s) {
+		return containsAt(s, substr, start+1)
+	}
+	if s[start:start+len(substr)] == substr {
+		return true
+	}
+	return containsAt(s, substr, start+1)
+}