feat(vendordep): add vendordep management

- Add vendordep add
- Add vendordep remove
- Add vendordep list
- Refactor downloading

cmd/vendordep/remote.go

@@ -0,0 +1,66 @@
+package vendordep
+
+import (
+	"errors"
+	"io/fs"
+	"log/slog"
+	"regexp"
+	"rph/cmd/vendordep/artifactory"
+	"time"
+)
+
+type OnlineVendordep struct {
+	VendordepName string
+	Version string
+	FileName string
+	LastModTime time.Time
+}
+
+func ListAvailableOnlineDeps(year string) (map[string][]OnlineVendordep, error) {
+	fsys := artifactory.New(artifactory.DefaultVendorDepArtifactoryUrl)
+	path := "vendordeps/vendordep-marketplace/" + year
+
+	entries, err := fs.ReadDir(fsys, path)
+	if err != nil {
+		slog.Error("Failed to readdir from artifactory", "dir", path, "error", err)
+		return nil, err
+	}
+
+	type fileEntry struct {
+		Name string
+		ModTime time.Time
+	}
+
+	files := make([]fileEntry, len(entries))
+	for i, e := range entries {
+		info, err := e.Info()
+		if err != nil {
+			return nil, err
+		}
+
+		files[i] = fileEntry{ Name: e.Name(), ModTime: info.ModTime() }
+	}
+
+	allDeps := make(map[string][]OnlineVendordep, len(entries))
+
+	// breaks a vendordep file name into "name-of-library" and "v2025.9.28"
+	re := regexp.MustCompile(`^(.+)-v?(\d+\.\d+(?:\.\d+)?)`)
+	for _, file := range files {
+		matches := re.FindStringSubmatch(file.Name)
+		if len(matches) > 2 {
+			baseName := matches[1]
+			version := matches[2]
+
+			allDeps[baseName] = append(allDeps[baseName], OnlineVendordep{
+				VendordepName: baseName,
+				Version: version,
+				FileName: file.Name,
+				LastModTime: file.ModTime,
+			})
+		} else {
+			return nil, errors.New("Vendordep file name does not match format '" + file.Name + "'")
+		}
+	}
+
+	return allDeps, nil
+}