feat: add dynamic printer configuration manager

Co-authored-by: aider (openai/DeepSeek-V3.2-Thinking) <aider@aider.chat>

inventory-backend/app/services/print/label_service.py

@@ -3,6 +3,7 @@ import base64
 import os
 from io import BytesIO
 from PIL import Image, ImageDraw, ImageFont
+from .print_config import PrintConfigManager
 
 # 引入二维码生成库
 try:
@@ -12,8 +13,7 @@ except ImportError:
 
 
 class LabelPrintService:
-    PRINTER_IP = "192.168.9.221"
-    PRINTER_PORT = 9100
+    # Printer IP and port now managed by PrintConfigManager
 
     # ================= 1. 尺寸与分辨率配置 (300 DPI) =================
     DOTS_PER_MM = 12  # 300 DPI
@@ -271,8 +271,9 @@ class LabelPrintService:
 
     @staticmethod
     def send_to_printer(data):
-        ip = LabelPrintService.PRINTER_IP
-        port = LabelPrintService.PRINTER_PORT
+        config = PrintConfigManager.get_config('label_printer')
+        ip = config['ip']
+        port = config['port']
 
         try:
             # 1. 获取 RGB 图像