feat: add Cobra CLI, LSP/MCP registries, workflow engine, and enriched dashboard

Major changes:
- Refactor CLI entry point to Cobra commands (root, setup, scan, doctor, install, update, lsp, mcp, skills, config, version)
- Add LSP registry with health checks, auto-install, and editor config generation
- Add MCP registry with editor detection, status tracking, and per-editor configuration
- Add workflow engine with planner and step execution for automated task chains
- Add conversation search, export (Markdown/JSON), and detailed token counting
- Add streaming shell chat handler with tool call/result events
- Add skill validation, dry-run testing, and export endpoints
- Enrich dashboard with Tools/Activity/Status tabs and tool cards grid
- Add PRD documentation
- Complete i18n for both EN and FR

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

cmd/muyue/commands/update.go

@@ -0,0 +1,80 @@
+package commands
+
+import (
+	"fmt"
+
+	"github.com/muyue/muyue/internal/scanner"
+	"github.com/muyue/muyue/internal/updater"
+	"github.com/spf13/cobra"
+)
+
+var updateCmd = &cobra.Command{
+	Use:   "update [tool]",
+	Short: "Check and apply updates",
+	Args:  cobra.RangeArgs(0, 1),
+	RunE:  runUpdate,
+}
+
+var checkOnly bool
+
+func init() {
+	rootCmd.AddCommand(updateCmd)
+	updateCmd.Flags().BoolVar(&checkOnly, "check", false, "Check only, don't update")
+}
+
+func runUpdate(cmd *cobra.Command, args []string) error {
+	result := scanner.ScanSystem()
+	statuses := updater.CheckUpdates(result)
+
+	if len(args) > 0 {
+		for _, u := range statuses {
+			if u.Tool == args[0] {
+				if u.NeedsUpdate {
+					fmt.Printf("%s: %s → %s\n", u.Tool, u.Current, u.Latest)
+					if !checkOnly {
+						updater.RunAutoUpdate([]updater.UpdateStatus{u})
+						fmt.Println("Updated!")
+					}
+				} else {
+					fmt.Printf("%s is up to date (%s)\n", u.Tool, u.Current)
+				}
+				return nil
+			}
+		}
+		fmt.Printf("Tool '%s' not found\n", args[0])
+		return nil
+	}
+
+	fmt.Printf("%-15s %-10s %-10s %-10s\n", "Tool", "Current", "Latest", "Status")
+	fmt.Println("─────────────────────────────────────────")
+	hasUpdates := false
+	for _, u := range statuses {
+		status := "✓"
+		if u.NeedsUpdate {
+			status = "⟳ update"
+			hasUpdates = true
+		}
+		if u.Error != "" {
+			status = "✗ " + u.Error
+		}
+		fmt.Printf("%-15s %-10s %-10s %-10s\n", u.Tool, u.Current, u.Latest, status)
+	}
+
+	if checkOnly {
+		return nil
+	}
+
+	if hasUpdates {
+		toUpdate := make([]updater.UpdateStatus, 0)
+		for _, u := range statuses {
+			if u.NeedsUpdate {
+				toUpdate = append(toUpdate, u)
+			}
+		}
+		updater.RunAutoUpdate(toUpdate)
+		fmt.Println("\nUpdates applied.")
+	} else {
+		fmt.Println("\nAll tools are up to date.")
+	}
+	return nil
+}