feat(vault-tui): implement KV client and service for managing secrets

- Added internal/vault/client.go for creating a Vault client with configuration settings.
- Introduced internal/vault/errors.go to classify Vault API errors for better UI handling.
- Created internal/vault/kv.go to manage KV secrets, including listing, reading, writing, and deleting operations.
- Implemented internal/vault/mounts.go to list and describe secret engine mounts.
- Developed internal/vault/service.go to provide a unified entry point for Vault operations.
- Added internal/vault/kv_test.go for comprehensive testing of KV operations.
- Introduced internal/ui/toast.go for transient notifications in the UI.
- Added renovate.json for dependency management and updates.

internal/cli/status.go

@@ -0,0 +1,61 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/urfave/cli/v3"
+)
+
+func statusCommand() *cli.Command {
+	return &cli.Command{
+		Name:  "status",
+		Usage: "show the resolved profile, address, and token status",
+		Flags: []cli.Flag{
+			&cli.BoolFlag{Name: "json"},
+		},
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			a, err := appFrom(ctx)
+			if err != nil {
+				return err
+			}
+			s := a.Settings
+			out := map[string]string{
+				"profile":     s.Profile,
+				"address":     fmt.Sprintf("%s (%s)", s.Address, s.OriginOf("address").Key),
+				"namespace":   valueOr(s.Namespace, "(none)"),
+				"read_only":   fmt.Sprint(s.ReadOnly),
+				"auth_method": valueOr(s.Auth.Method, "(unset)"),
+				"token_store": fmt.Sprintf("%s (%s)", a.Store.Kind(), a.Store.Location()),
+			}
+
+			info, err := a.EnsureLoggedIn(ctx, cmd.String("token"))
+			if err != nil {
+				out["token"] = fmt.Sprintf("none/invalid: %v", err)
+				if cmd.Bool("json") {
+					return printJSON(os.Stdout, out)
+				}
+				printKV(os.Stdout, out)
+				return nil
+			}
+			out["token_accessor"] = info.Accessor
+			out["token_policies"] = fmt.Sprint(info.Policies)
+			out["token_ttl"] = info.TTL.String()
+			out["token_renewable"] = fmt.Sprint(info.Renewable)
+
+			if cmd.Bool("json") {
+				return printJSON(os.Stdout, out)
+			}
+			printKV(os.Stdout, out)
+			return nil
+		},
+	}
+}
+
+func valueOr(v, fallback string) string {
+	if v == "" {
+		return fallback
+	}
+	return v
+}