feat: add registry config, image upload/download, and OCI format support

Backend:
- Add registry_address configuration API (GET/POST)
- Add tar image upload with OCI and Docker format support
- Add image download with streaming optimization
- Fix blob download using c.Send (Fiber v3 SendStream bug)
- Add registry_address prefix stripping for all OCI v2 endpoints
- Add AGENTS.md for project documentation

Frontend:
- Add settings store with Snackbar notifications
- Add image upload dialog with progress bar
- Add download state tracking with multi-stage feedback
- Replace alert() with MUI Snackbar messages
- Display image names without registry_address prefix

🤖 Generated with [Qoder](https://qoder.com)

pkg/tool/string.go

@@ -0,0 +1,71 @@
+package tool
+
+import (
+	"encoding/json"
+	"strings"
+	"unsafe"
+)
+
+func BytesToString(b []byte) string {
+	return unsafe.String(unsafe.SliceData(b), len(b))
+}
+
+func StringToBytes(s string) []byte {
+	return unsafe.Slice(unsafe.StringData(s), len(s))
+}
+
+func CopyString(s string) string {
+	return string([]byte(s))
+}
+
+// ToSnakeCase 将给定的字符串转换为 snake_case 风格。
+//
+// 参数:
+//
+//	str: 待转换的字符串，只考虑 ASCII 字符。
+func ToSnakeCase(str string) string {
+	if str == "" {
+		return ""
+	}
+
+	var (
+		sb      strings.Builder
+		isLower = func(c byte) bool {
+			return c >= 'a' && c <= 'z'
+		}
+		isUpper = func(c byte) bool {
+			return c >= 'A' && c <= 'Z'
+		}
+	)
+
+	for i := 0; i < len(str); i++ {
+		c := str[i]
+
+		var prev byte
+		if i > 0 {
+			prev = str[i-1]
+		}
+
+		var next byte
+		if i < len(str)-1 {
+			next = str[i+1]
+		}
+
+		if isUpper(c) && (isLower(prev) || isLower(next)) {
+			sb.WriteRune('_')
+			sb.WriteByte(c + ('a' - 'A'))
+		} else if isUpper(c) {
+			sb.WriteByte(c + ('a' - 'A'))
+		} else {
+			sb.WriteRune(rune(c))
+		}
+	}
+
+	// 去除首尾下划线
+	return strings.Trim(sb.String(), "_")
+}
+
+func PrettyJSON(v any) string {
+	b, _ := json.MarshalIndent(v, "", "  ")
+	return string(b)
+}