chore: fork from IRIS track 供 LICA 部门独立运行

- 复制来源: /home/yueli/track @ 192c8ee (feature/ai-audit-update)
- 组织隔离目标: LICA
- 端口规划: 前端 8030 / 后端 8031 / 数据库 8032
- 已排除 deploy.sh、deploy_full.sh、docker-compose.prod.yml（IRIS 生产发布脚本）
- 已排除工作区未提交改动，取干净的 192c8ee 状态

backend/app/services/print_config.py

@@ -0,0 +1,44 @@
+"""打印机配置管理 — JSON 文件持久化"""
+import json
+import os
+from pathlib import Path
+
+CONFIG_DIR = Path(__file__).resolve().parent.parent.parent / "data"
+CONFIG_FILE = CONFIG_DIR / "printer_config.json"
+
+DEFAULT_CONFIG = {
+    "label_printer": {
+        "ip": "192.168.9.221",
+        "port": 9100,
+        "enabled": False,
+    },
+}
+
+
+class PrintConfigManager:
+    """打印机 IP/端口 配置读写"""
+
+    @staticmethod
+    def _ensure_file() -> None:
+        if not CONFIG_DIR.exists():
+            CONFIG_DIR.mkdir(parents=True)
+        if not CONFIG_FILE.exists():
+            PrintConfigManager.save_config(DEFAULT_CONFIG)
+
+    @staticmethod
+    def get_config() -> dict:
+        PrintConfigManager._ensure_file()
+        with open(CONFIG_FILE, "r", encoding="utf-8") as f:
+            return json.load(f)
+
+    @staticmethod
+    def save_config(config: dict) -> None:
+        if not CONFIG_DIR.exists():
+            CONFIG_DIR.mkdir(parents=True)
+        with open(CONFIG_FILE, "w", encoding="utf-8") as f:
+            json.dump(config, f, indent=2, ensure_ascii=False)
+
+    @staticmethod
+    def get_printer(name: str = "label_printer") -> dict:
+        config = PrintConfigManager.get_config()
+        return config.get(name, DEFAULT_CONFIG.get("label_printer", {}))