Feat: add skills space to context engine (#13908)

### What problem does this PR solve?

issue #13714

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

cmd/cli/ragflow_cli.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"ragflow/internal/cli"
+	"ragflow/internal/logger"
+)
+
+func main() {
+	// Parse command line arguments (skip program name)
+	args, err := cli.ParseConnectionArgs(os.Args[1:])
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Initialize logger with appropriate level
+	logLevel := "warn" // Default to warn (quiet mode)
+	if args.Verbose {
+		logLevel = "info"
+	}
+	if err := logger.Init(logLevel); err != nil {
+		fmt.Printf("Warning: Failed to initialize logger: %v\n", err)
+	}
+
+	// Show help and exit
+	if args.ShowHelp {
+		cli.PrintUsage()
+		os.Exit(0)
+	}
+
+	// Create CLI instance with parsed arguments
+	cliApp, err := cli.NewCLIWithArgs(args)
+	if err != nil {
+		fmt.Printf("Failed to create CLI: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Handle interrupt signal
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+	go func() {
+		<-sigChan
+		cliApp.Cleanup()
+		os.Exit(0)
+	}()
+
+	// Check if we have a single command to execute
+	if args.Command != nil {
+		// Single command mode
+		if err = cliApp.RunSingleCommand(args.Command); err != nil {
+			fmt.Printf("Error: %v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		// Interactive mode
+		if err = cliApp.Run(); err != nil {
+			fmt.Printf("CLI error: %v\n", err)
+			os.Exit(1)
+		}
+	}
+}