fix: added package update endpoint

internal/modules/packages/packages.go

@@ -65,6 +65,10 @@ type RemoveInput struct {
 	Name string `path:"name" example:"htop" doc:"Package to remove"`
 }
 
+type UpgradeOneInput struct {
+	Name string `path:"name" example:"htop" doc:"Package to upgrade"`
+}
+
 // SSE event types for streaming package operations.
 type PkgOutputEvent struct {
 	Line string `json:"line" doc:"One line of the package manager's terminal output"`
@@ -162,6 +166,25 @@ func registerPackages(api huma.API, pm manager) {
 		bin, args := pm.upgradeArgs()
 		streamOp(ctx, send, bin, args)
 	})
+
+	sse.Register(api, huma.Operation{
+		OperationID: "packages-upgrade-one",
+		Method:      "POST",
+		Path:        "/api/packages/upgrade/{name}",
+		Summary:     "Upgrade a single package (streamed)",
+		Description: "Upgrades the named package to its latest version, streaming the " +
+			"package manager's output live. apt uses `install --only-upgrade` so the " +
+			"package must already be installed; dnf/pacman handle this natively.",
+		Tags:     []string{tagPackages},
+		Metadata: op("write"),
+	}, pkgEvents, func(ctx context.Context, in *UpgradeOneInput, send sse.Sender) {
+		if validateName(in.Name) != nil {
+			send.Data(PkgErrorEvent{Message: "invalid package name: " + in.Name})
+			return
+		}
+		bin, args := pm.upgradeOneArgs(in.Name)
+		streamOp(ctx, send, bin, args)
+	})
 }
 
 // streamOp runs a package write and streams its combined output to the client.
@@ -293,6 +316,21 @@ func (m manager) upgradeArgs() (string, []string) {
 	return "", nil
 }
 
+// upgradeOneArgs upgrades a single package to its latest version. apt's
+// `install --only-upgrade` is the safe variant (won't install if absent);
+// pacman -S re-syncs to latest; dnf upgrade is naturally scoped by name.
+func (m manager) upgradeOneArgs(name string) (string, []string) {
+	switch m.name {
+	case "dnf":
+		return "dnf", []string{"upgrade", "-y", "--", name}
+	case "apt":
+		return "apt-get", []string{"install", "--only-upgrade", "-y", "--", name}
+	case "pacman":
+		return "pacman", []string{"-S", "--noconfirm", "--", name}
+	}
+	return "", nil
+}
+
 // --- parsers (pure, tested) --------------------------------------------------
 
 // parseTabbed reads "name\tversion" lines (dpkg-query / rpm output).