新增 XSLPrintDot 项目，包含打印服务的核心功能和相关配置。实现打印机查询、打印任务处理、远程转发功能，并支持多平台设备ID获取。优化打印数据准备逻辑，增强系统的可维护性和扩展性，同时更新工作区配置以支持新项目。

XSLPrintDot/backend_unix.go

@@ -0,0 +1,157 @@
+//go:build !windows
+
+package main
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+func (b *Bridge) getPrintersPlatform() ([]PrinterInfo, error) {
+	defaultName := ""
+	if out, err := exec.Command("lpstat", "-d").Output(); err == nil {
+		line := strings.TrimSpace(string(out))
+		if idx := strings.LastIndex(line, ":"); idx >= 0 {
+			defaultName = strings.TrimSpace(line[idx+1:])
+		}
+	}
+
+	cmd := exec.Command("sh", "-c", "lpstat -a | cut -d ' ' -f 1")
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	lines := strings.Split(string(output), "\n")
+	var printers []PrinterInfo
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed != "" {
+			printers = append(printers, PrinterInfo{Name: trimmed, IsDefault: trimmed == defaultName})
+		}
+	}
+	return printers, nil
+}
+
+func (b *Bridge) getPrinterCapabilitiesPlatform(printerName string) (map[string]interface{}, error) {
+	printerName = strings.TrimSpace(printerName)
+	if printerName == "" {
+		return nil, fmt.Errorf("printer name is empty")
+	}
+
+	cmd := exec.Command("lpoptions", "-p", printerName, "-l")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("lpoptions error: %v, output: %s", err, string(output))
+	}
+
+	options := map[string]map[string]interface{}{}
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		parts := strings.SplitN(line, ":", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		left := strings.TrimSpace(parts[0])
+		right := strings.TrimSpace(parts[1])
+		optName := left
+		if idx := strings.Index(left, "/"); idx >= 0 {
+			optName = strings.TrimSpace(left[:idx])
+		}
+
+		values := []string{}
+		defaultValue := ""
+		for _, token := range strings.Fields(right) {
+			if strings.HasPrefix(token, "*") {
+				clean := strings.TrimPrefix(token, "*")
+				defaultValue = clean
+				values = append(values, clean)
+				continue
+			}
+			values = append(values, token)
+		}
+
+		options[optName] = map[string]interface{}{
+			"values":  values,
+			"default": defaultValue,
+			"raw":     right,
+		}
+	}
+
+	return map[string]interface{}{
+		"printer": printerName,
+		"options": options,
+	}, nil
+}
+
+func (b *Bridge) printPDFPlatform(printerName, filePath string, options PrintOptions) error {
+	args := []string{"-d", printerName}
+
+	if options.Copies > 1 {
+		args = append(args, "-n", fmt.Sprintf("%d", options.Copies))
+	}
+
+	if options.PageRange != "" {
+		args = append(args, "-P", options.PageRange)
+	}
+
+	switch strings.ToLower(strings.TrimSpace(options.PageSet)) {
+	case "even":
+		args = append(args, "-o", "page-set=even")
+	case "odd":
+		args = append(args, "-o", "page-set=odd")
+	}
+
+	switch strings.ToLower(strings.TrimSpace(options.Duplex)) {
+	case "long-edge", "long", "duplex", "duplexlong":
+		args = append(args, "-o", "sides=two-sided-long-edge")
+	case "short-edge", "short", "duplexshort":
+		args = append(args, "-o", "sides=two-sided-short-edge")
+	case "simplex", "one-sided":
+		args = append(args, "-o", "sides=one-sided")
+	}
+
+	switch strings.ToLower(strings.TrimSpace(options.ColorMode)) {
+	case "color":
+		args = append(args, "-o", "ColorModel=RGB")
+	case "mono", "monochrome", "grayscale", "gray":
+		args = append(args, "-o", "ColorModel=Gray")
+	}
+
+	if options.Paper != "" {
+		args = append(args, "-o", fmt.Sprintf("media=%s", options.Paper))
+	}
+
+	switch strings.ToLower(strings.TrimSpace(options.Scale)) {
+	case "noscale", "none", "actual":
+		args = append(args, "-o", "scaling=100")
+	case "shrink":
+		// Default CUPS behavior already shrinks to fit if needed
+	case "fit":
+		args = append(args, "-o", "fit-to-page")
+	}
+
+	switch strings.ToLower(strings.TrimSpace(options.Orientation)) {
+	case "portrait":
+		args = append(args, "-o", "orientation-requested=3")
+	case "landscape":
+		args = append(args, "-o", "orientation-requested=4")
+	}
+
+	if options.TrayBin != "" {
+		args = append(args, "-o", fmt.Sprintf("InputSlot=%s", options.TrayBin))
+	}
+
+	args = append(args, filePath)
+
+	cmd := exec.Command("lp", args...)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("lp error: %v, output: %s", err, string(out))
+	}
+	return nil
+}