feat(01-05): add CLI root command, config package, output table, and settings helpers

- cmd/root.go: Cobra root with all 11 subcommands, viper config loading
- cmd/stubs.go: 8 stub commands for future phases (verify, import, recon, keys, serve, dorks, hook, schedule)
- cmd/scan.go: scan command wiring engine + storage + output with per-installation salt
- cmd/providers.go: providers list/info/stats subcommands
- cmd/config.go: config init/set/get subcommands
- pkg/config/config.go: Config struct with Load() and defaults
- pkg/output/table.go: lipgloss terminal table for PrintFindings
- pkg/storage/settings.go: GetSetting/SetSetting for settings table CRUD

cmd/config.go

@@ -0,0 +1,77 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var configCmd = &cobra.Command{
+	Use:   "config",
+	Short: "Manage KeyHunter configuration",
+}
+
+var configInitCmd = &cobra.Command{
+	Use:   "init",
+	Short: "Create default configuration file at ~/.keyhunter.yaml",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return fmt.Errorf("cannot determine home directory: %w", err)
+		}
+		configPath := filepath.Join(home, ".keyhunter.yaml")
+
+		// Set defaults before writing
+		viper.SetDefault("scan.workers", 0)
+		viper.SetDefault("database.path", filepath.Join(home, ".keyhunter", "keyhunter.db"))
+
+		if err := viper.WriteConfigAs(configPath); err != nil {
+			return fmt.Errorf("writing config: %w", err)
+		}
+		fmt.Printf("Config initialized: %s\n", configPath)
+		return nil
+	},
+}
+
+var configSetCmd = &cobra.Command{
+	Use:   "set <key> <value>",
+	Short: "Set a configuration value",
+	Args:  cobra.ExactArgs(2),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		key, value := args[0], args[1]
+		viper.Set(key, value)
+		if err := viper.WriteConfig(); err != nil {
+			// If config file doesn't exist yet, create it
+			home, _ := os.UserHomeDir()
+			configPath := filepath.Join(home, ".keyhunter.yaml")
+			if err2 := viper.WriteConfigAs(configPath); err2 != nil {
+				return fmt.Errorf("writing config: %w", err2)
+			}
+		}
+		fmt.Printf("Set %s = %s\n", key, value)
+		return nil
+	},
+}
+
+var configGetCmd = &cobra.Command{
+	Use:   "get <key>",
+	Short: "Get a configuration value",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		val := viper.Get(args[0])
+		if val == nil {
+			return fmt.Errorf("key %q not found", args[0])
+		}
+		fmt.Printf("%v\n", val)
+		return nil
+	},
+}
+
+func init() {
+	configCmd.AddCommand(configInitCmd)
+	configCmd.AddCommand(configSetCmd)
+	configCmd.AddCommand(configGetCmd)
+}