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/doctor.go

@@ -0,0 +1,77 @@
+package commands
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/muyue/muyue/internal/config"
+	"github.com/muyue/muyue/internal/scanner"
+	"github.com/spf13/cobra"
+)
+
+var doctorCmd = &cobra.Command{
+	Use:   "doctor",
+	Short: "Diagnose issues (scan + config check + connectivity)",
+	RunE:  runDoctor,
+}
+
+func init() {
+	rootCmd.AddCommand(doctorCmd)
+}
+
+func runDoctor(cmd *cobra.Command, args []string) error {
+	fmt.Println("Running Muyue diagnostics...")
+
+	fmt.Println("\n=== System Scan ===")
+	result := scanner.ScanSystem()
+	for _, t := range result.Tools {
+		status := "✓"
+		if !t.Installed {
+			status = "✗"
+		}
+		fmt.Printf("  %s %s\n", status, t.Name)
+	}
+	fmt.Printf("\nInstalled: %d/%d\n", countInstalled(result.Tools), len(result.Tools))
+
+	fmt.Println("\n=== Config Check ===")
+	cfg, err := config.Load()
+	if err != nil {
+		fmt.Printf("  ✗ Failed to load config: %v\n", err)
+	} else {
+		fmt.Printf("  ✓ Config loaded (version: %s)\n", cfg.Version)
+		if cfg.Profile.Name != "" {
+			fmt.Printf("  ✓ Profile: %s\n", cfg.Profile.Name)
+		}
+	}
+
+	fmt.Println("\n=== Connectivity ===")
+	endpoints := []string{
+		"https://api.minimax.io",
+		"https://api.openai.com",
+	}
+	for _, ep := range endpoints {
+		fmt.Printf("  Checking %s... ", ep)
+		client := &http.Client{Timeout: 5 * time.Second}
+		resp, err := client.Head(ep)
+		if err != nil {
+			fmt.Printf("✗ (%v)\n", err)
+		} else {
+			resp.Body.Close()
+			fmt.Printf("✓ (status %d)\n", resp.StatusCode)
+		}
+	}
+
+	fmt.Println("\n=== Diagnosis complete ===")
+	return nil
+}
+
+func countInstalled(tools []scanner.ToolStatus) int {
+	installed := 0
+	for _, t := range tools {
+		if t.Installed {
+			installed++
+		}
+	}
+	return installed
+}