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/tools_test.go

@@ -0,0 +1,81 @@
+package tool
+
+import "testing"
+
+func TestPercent(t *testing.T) {
+	type args struct {
+		val        float64
+		minVal     float64
+		maxVal     float64
+		minPercent float64
+		maxPercent float64
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "case 1",
+			args: args{
+				val:        0.5,
+				minVal:     0,
+				maxVal:     1,
+				minPercent: 0,
+				maxPercent: 1,
+			},
+			want: "50%",
+		},
+		{
+			name: "case 2",
+			args: args{
+				val:        0.3,
+				minVal:     0.1,
+				maxVal:     0.6,
+				minPercent: 0,
+				maxPercent: 1,
+			},
+			want: "40%",
+		},
+		{
+			name: "case 3",
+			args: args{
+				val:        700,
+				minVal:     700,
+				maxVal:     766,
+				minPercent: 0.1,
+				maxPercent: 0.7,
+			},
+			want: "10%",
+		},
+		{
+			name: "case 4",
+			args: args{
+				val:        766,
+				minVal:     700,
+				maxVal:     766,
+				minPercent: 0.1,
+				maxPercent: 0.7,
+			},
+			want: "70%",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Percent(tt.args.val, tt.args.minVal, tt.args.maxVal, tt.args.minPercent, tt.args.maxPercent); got != tt.want {
+				t.Errorf("Percent() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCopyString(t *testing.T) {
+	s1 := "hello"
+	s2 := CopyString(s1)
+
+	if &s1 == &s2 {
+		t.Errorf("CopyString fail")
+	}
+
+	t.Log(s1, s2)
+}