npx skills add https://github.com/rendis/pdf-forge --skill pdf-forge

Tenant → Workspace → Template → Version (DRAFT→PUBLISHED)
                                    ↓
                              Injectables (variables)
                                    ↓
                              Render → PDF

// core/extensions/register.go
func Register(engine *sdk.Engine) {
    engine.RegisterInjector(&CustomerNameInjector{})
    engine.SetMapper(&MyMapper{})
    engine.SetInitFunc(MyInit())
}

// core/cmd/api/main.go
func main() {
    engine := sdk.NewWithConfig("settings/app.yaml").
        SetI18nFilePath("settings/injectors.i18n.yaml")
    extensions.Register(engine)
    if err := engine.Run(); err != nil {
        slog.Error("failed to run engine", slog.String("error", err.Error()))
        os.Exit(1)
    }
}

type CustomerNameInjector struct{}

func (i *CustomerNameInjector) Code() string { return "customer_name" }

func (i *CustomerNameInjector) Resolve() (sdk.ResolveFunc, []string) {
    return func(ctx context.Context, injCtx *sdk.InjectorContext) (*sdk.InjectorResult, error) {
        payload := injCtx.RequestPayload().(map[string]any)
        return &sdk.InjectorResult{Value: sdk.StringValue(payload["name"].(string))}, nil
    }, nil  // dependencies
}

func (i *CustomerNameInjector) IsCritical() bool              { return true }
func (i *CustomerNameInjector) Timeout() time.Duration        { return 5 * time.Second }
func (i *CustomerNameInjector) DataType() sdk.ValueType       { return sdk.ValueTypeString }
func (i *CustomerNameInjector) DefaultValue() *sdk.InjectableValue { return nil }
func (i *CustomerNameInjector) Formats() *sdk.FormatConfig    { return nil }

make build      # Build frontend + embed + Go binary (single binary)
make embed-app  # Build frontend and copy to Go embed location
make run        # Run API server (with embedded frontend)
make dev        # Hot reload backend (air)
make migrate    # Apply database migrations
make test       # Run tests
make lint       # Run linter
make swagger    # Regenerate OpenAPI spec
make doctor     # Check system dependencies