feat(t226): add Go ERP session login

backend-api/internal/config/config_test.go

@@ -52,6 +52,17 @@ func TestLoadUsesSafeDefaults(t *testing.T) {
 			cfg.ERPConnectorTimeout,
 		)
 	}
+	if cfg.ShunyunbaoURL != "https://www.shunyunbaoerp.com" ||
+		cfg.ShunyunbaoUsername != "" || cfg.ShunyunbaoPassword != "" ||
+		cfg.ShunyunbaoTimeout != 30*time.Second {
+		t.Fatalf(
+			"shunyunbao defaults = %q / %q / %q / %s",
+			cfg.ShunyunbaoURL,
+			cfg.ShunyunbaoUsername,
+			cfg.ShunyunbaoPassword,
+			cfg.ShunyunbaoTimeout,
+		)
+	}
 }
 
 func TestLoadAcceptsExplicitConfiguration(t *testing.T) {
@@ -66,6 +77,9 @@ func TestLoadAcceptsExplicitConfiguration(t *testing.T) {
 		ReadinessTTLEnvironment:       "3m",
 		ERPConnectorURLEnvironment:    "http://localhost:18091",
 		ERPConnectorAPIKeyEnvironment: "12345678901234567890123456789012",
+		ShunyunbaoURLEnvironment:      "https://erp.example.test:8443",
+		ShunyunbaoUsernameEnvironment: "service-user",
+		ShunyunbaoPasswordEnvironment: " pass with spaces ",
 	}
 
 	cfg, err := Load(mapEnvironment(values))
@@ -108,6 +122,11 @@ func TestLoadAcceptsExplicitConfiguration(t *testing.T) {
 			cfg.ERPConnectorAPIKey,
 		)
 	}
+	if cfg.ShunyunbaoURL != values[ShunyunbaoURLEnvironment] ||
+		cfg.ShunyunbaoUsername != values[ShunyunbaoUsernameEnvironment] ||
+		cfg.ShunyunbaoPassword != values[ShunyunbaoPasswordEnvironment] {
+		t.Fatalf("shunyunbao config was not preserved")
+	}
 }
 
 func TestLoadRejectsUnsafeOrInvalidValues(t *testing.T) {
@@ -133,6 +152,30 @@ func TestLoadRejectsUnsafeOrInvalidValues(t *testing.T) {
 				ERPConnectorAPIKeyEnvironment: "short",
 			},
 		},
+		{
+			name: "non HTTPS shunyunbao URL",
+			values: map[string]string{
+				ShunyunbaoURLEnvironment: "http://erp.example.test",
+			},
+		},
+		{
+			name: "shunyunbao URL path",
+			values: map[string]string{
+				ShunyunbaoURLEnvironment: "https://erp.example.test/private",
+			},
+		},
+		{
+			name: "shunyunbao username without password",
+			values: map[string]string{
+				ShunyunbaoUsernameEnvironment: "service-user",
+			},
+		},
+		{
+			name: "shunyunbao password without username",
+			values: map[string]string{
+				ShunyunbaoPasswordEnvironment: "password",
+			},
+		},
 		{
 			name: "blank explicit address",
 			values: map[string]string{