chore: init bj_power monorepo (dashboard/mes/wms/wms_client/workstation), clear subproject git metadata and align naming to folder names

bj_power_wms/internal/config/config.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type Config struct {
+	APIURL      string `json:"api_url"`
+	SerialPort  string `json:"serial_port"`
+	BaudRate    int    `json:"baud_rate"`
+	DisplayUnit string `json:"display_unit"`
+}
+
+func Load(path string) (Config, error) {
+	cfg := Config{
+		APIURL:      "http://localhost:8888",
+		SerialPort:  "COM7",
+		BaudRate:    115200,
+		DisplayUnit: "mm",
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if err := cfg.Save(path); err != nil {
+				return cfg, err
+			}
+			return cfg, nil
+		}
+		return cfg, err
+	}
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return cfg, err
+	}
+	return cfg, nil
+}
+
+func (c Config) Save(path string) error {
+	data, err := json.MarshalIndent(c, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, data, 0644)
+}