feat(t229): load ERP credentials from dotenv

backend-api/cmd/api/main.go

@@ -34,7 +34,7 @@ func main() {
 }
 
 func run() error {
-	cfg, err := config.Load(os.LookupEnv)
+	cfg, err := loadConfig(os.LookupEnv, config.DefaultERPEnvironmentFile)
 	if err != nil {
 		return err
 	}
@@ -93,6 +93,20 @@ func run() error {
 	}
 }
 
+func loadConfig(
+	lookup config.LookupEnvironment,
+	environmentFile string,
+) (config.Config, error) {
+	effectiveLookup, err := config.WithERPEnvironmentFile(
+		environmentFile,
+		lookup,
+	)
+	if err != nil {
+		return config.Config{}, err
+	}
+	return config.Load(effectiveLookup)
+}
+
 func shutdownServer(
 	server *http.Server,
 	serverErrors <-chan error,

backend-api/cmd/api/main_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
+	"os"
 	"path/filepath"
 	"testing"
 	"time"
@@ -16,6 +17,40 @@ import (
 	"cmroubao/backend-api/internal/platform/migration"
 )
 
+func TestLoadConfigUsesERPEnvironmentFile(t *testing.T) {
+	environmentFile := filepath.Join(t.TempDir(), ".env")
+	err := os.WriteFile(environmentFile, []byte(
+		"CMROUBAO_SHUNYUNBAO_URL=https://erp.example.test\n"+
+			"CMROUBAO_SHUNYUNBAO_USERNAME=dotenv-user\n"+
+			"CMROUBAO_SHUNYUNBAO_PASSWORD=dotenv-password\n",
+	), 0o600)
+	if err != nil {
+		t.Fatalf("os.WriteFile() error = %v", err)
+	}
+
+	cfg, err := loadConfig(func(name string) (string, bool) {
+		if name == config.ShunyunbaoUsernameEnvironment {
+			return "process-user", true
+		}
+		return "", false
+	}, environmentFile)
+	if err != nil {
+		t.Fatalf("loadConfig() error = %v", err)
+	}
+	if cfg.ShunyunbaoURL != "https://erp.example.test" ||
+		cfg.ShunyunbaoUsername != "process-user" ||
+		cfg.ShunyunbaoPassword != "dotenv-password" {
+		t.Fatalf(
+			"ERP config = %#v",
+			struct {
+				URL      string
+				Username string
+				Password string
+			}{cfg.ShunyunbaoURL, cfg.ShunyunbaoUsername, cfg.ShunyunbaoPassword},
+		)
+	}
+}
+
 func TestShutdownServerForceClosesAfterGracefulTimeout(t *testing.T) {
 	handlerStarted := make(chan struct{})
 	releaseHandler := make(chan struct{})