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/mask.go

@@ -0,0 +1,57 @@
+package tool
+
+import (
+	"strings"
+)
+
+func MaskJWT(token string) string {
+	if token == "" {
+		return ""
+	}
+
+	parts := strings.Split(token, ".")
+	if len(parts) != 3 {
+		return MaskString(token, 5, 5, -1, "*")
+	}
+
+	h, p, s := parts[0], parts[1], parts[2]
+	h, p, s = MaskString(h, 5, 5, 8, "*"), MaskString(p, 5, 5, 8, "*"), MaskString(s, 5, 5, 8, "*")
+	return h + "." + p + "." + s
+}
+
+// MaskString 将字符串中间部分替换为 maskChar
+//
+// start: 保留前 start 个字符
+// end: 保留后 end 个字符
+// maskLen: 中间打码长度 （小于 0 标识保持原有长度）
+// maskChar: 打码字符
+func MaskString(s string, start, end, maskLen int, maskChar string) string {
+	if s == "" {
+		return ""
+	}
+
+	totalLen := len(s)
+	if start < 0 {
+		start = 0
+	}
+
+	if end < 0 {
+		end = 0
+	}
+
+	if maskChar == "" {
+		maskChar = "*"
+	}
+
+	maxMaskLen := totalLen - start - end
+	if maxMaskLen <= 0 {
+		return strings.Repeat(maskChar, totalLen)
+	}
+
+	if maskLen < 0 || maskLen > maxMaskLen {
+		maskLen = maxMaskLen
+	}
+
+	startPart, endPart := s[:start], s[totalLen-end:]
+	return startPart + strings.Repeat(maskChar, maskLen) + endPart
+}