Remove internal/content package and use engine directly

- Eliminate content.Enhancer wrapper around engine.ContentEngine
- Update cmd/enhance.go to call engine.ProcessFile/ProcessDirectory directly
- Update sites/manager.go to use engine.NewContentEngineWithAuth directly
- Remove unused EnhancementConfig and discovery configuration logic
- Simplify enhance command to use input path as site ID
- Remove CLI config dependency from config package

internal/config/config.go

@@ -3,7 +3,6 @@ package config
 type Config struct {
 	Database DatabaseConfig `yaml:"database" mapstructure:"database"`
 	API      APIConfig      `yaml:"api" mapstructure:"api"`
-	CLI      CLIConfig      `yaml:"cli" mapstructure:"cli"`
 	Server   ServerConfig   `yaml:"server" mapstructure:"server"`
 	Auth     AuthConfig     `yaml:"auth" mapstructure:"auth"`
 	Library  LibraryConfig  `yaml:"library" mapstructure:"library"`
@@ -18,10 +17,6 @@ type APIConfig struct {
 	Key string `yaml:"key" mapstructure:"key"`
 }
 
-type CLIConfig struct {
-	SiteID string `yaml:"site_id" mapstructure:"site_id"`
-}
-
 type ServerConfig struct {
 	Port  int          `yaml:"port" mapstructure:"port"`
 	Host  string       `yaml:"host" mapstructure:"host"`
@@ -29,18 +24,10 @@ type ServerConfig struct {
 }
 
 type AuthConfig struct {
-	DevMode      bool                   `yaml:"dev_mode" mapstructure:"dev_mode"`
-	Provider     string                 `yaml:"provider" mapstructure:"provider"`
-	JWTSecret    string                 `yaml:"jwt_secret" mapstructure:"jwt_secret"`
-	OAuthConfigs map[string]OAuthConfig `yaml:"oauth_configs" mapstructure:"oauth_configs"`
-	OIDC         *OIDCConfig            `yaml:"oidc" mapstructure:"oidc"`
-}
-
-type OAuthConfig struct {
-	ClientID     string   `yaml:"client_id" mapstructure:"client_id"`
-	ClientSecret string   `yaml:"client_secret" mapstructure:"client_secret"`
-	RedirectURL  string   `yaml:"redirect_url" mapstructure:"redirect_url"`
-	Scopes       []string `yaml:"scopes" mapstructure:"scopes"`
+	DevMode   bool        `yaml:"dev_mode" mapstructure:"dev_mode"`
+	Provider  string      `yaml:"provider" mapstructure:"provider"`
+	JWTSecret string      `yaml:"jwt_secret" mapstructure:"jwt_secret"`
+	OIDC      *OIDCConfig `yaml:"oidc" mapstructure:"oidc"`
 }
 
 type OIDCConfig struct {

internal/config/loader.go

@@ -69,9 +69,6 @@ func (l *viperLoader) LoadWithFlags(dbPath, apiURL, apiKey, siteID string) (*Con
 	if apiKey != "" {
 		config.API.Key = apiKey
 	}
-	if siteID != "" {
-		config.CLI.SiteID = siteID
-	}
 
 	return config, validate(config)
 }
@@ -81,10 +78,6 @@ func (l *viperLoader) setDefaults(config *Config) error {
 		config.Database.Path = "./insertr.db"
 	}
 
-	if config.CLI.SiteID == "" {
-		config.CLI.SiteID = "demo"
-	}
-
 	if config.Server.Port == 0 {
 		config.Server.Port = 8080
 	}

internal/config/validation.go

@@ -5,6 +5,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 )
 
@@ -17,10 +18,6 @@ func validate(config *Config) error {
 		return fmt.Errorf("api config: %w", err)
 	}
 
-	if err := validateCLI(config.CLI); err != nil {
-		return fmt.Errorf("cli config: %w", err)
-	}
-
 	if err := validateServer(config.Server); err != nil {
 		return fmt.Errorf("server config: %w", err)
 	}
@@ -66,18 +63,6 @@ func validateAPI(config APIConfig) error {
 	return nil
 }
 
-func validateCLI(config CLIConfig) error {
-	if config.SiteID == "" {
-		return fmt.Errorf("site_id is required")
-	}
-
-	if strings.TrimSpace(config.SiteID) != config.SiteID {
-		return fmt.Errorf("site_id cannot have leading or trailing whitespace")
-	}
-
-	return nil
-}
-
 func validateServer(config ServerConfig) error {
 	if config.Port < 1 || config.Port > 65535 {
 		return fmt.Errorf("port must be between 1 and 65535, got %d", config.Port)
@@ -136,13 +121,7 @@ func validateAuth(config AuthConfig) error {
 	}
 
 	validProviders := []string{"mock", "authentik"}
-	valid := false
-	for _, provider := range validProviders {
-		if config.Provider == provider {
-			valid = true
-			break
-		}
-	}
+	valid := slices.Contains(validProviders, config.Provider)
 	if !valid {
 		return fmt.Errorf("invalid provider %q, must be one of: %s", config.Provider, strings.Join(validProviders, ", "))
 	}