🐛 fix(data-sync): 修复已保存连接同步时未恢复密文

- Data Sync 分析/预览/同步入口统一恢复源库和目标库连接密文
- 避免已保存 PostgreSQL 连接因空密码触发 28P01
- 保留前端选择的源/目标数据库覆盖值
- 增加保存连接密文恢复回归测试
Refs #413

internal/app/methods_sync_test.go

@@ -0,0 +1,78 @@
+package app
+
+import (
+	"testing"
+
+	"GoNavi-Wails/internal/connection"
+	datasync "GoNavi-Wails/internal/sync"
+)
+
+func TestResolveDataSyncConfigSecretsRestoresSavedSourceAndTargetPasswords(t *testing.T) {
+	app := NewAppWithSecretStore(newFakeAppSecretStore())
+	app.configDir = t.TempDir()
+
+	_, err := app.SaveConnection(connection.SavedConnectionInput{
+		ID:   "source-pg",
+		Name: "Source PostgreSQL",
+		Config: connection.ConnectionConfig{
+			ID:       "source-pg",
+			Type:     "postgres",
+			Host:     "source.local",
+			Port:     5432,
+			User:     "postgres",
+			Password: "source-secret",
+			Database: "schedule",
+		},
+	})
+	if err != nil {
+		t.Fatalf("SaveConnection source returned error: %v", err)
+	}
+	_, err = app.SaveConnection(connection.SavedConnectionInput{
+		ID:   "target-pg",
+		Name: "Target PostgreSQL",
+		Config: connection.ConnectionConfig{
+			ID:       "target-pg",
+			Type:     "postgres",
+			Host:     "target.local",
+			Port:     5432,
+			User:     "postgres",
+			Password: "target-secret",
+			Database: "warehouse",
+		},
+	})
+	if err != nil {
+		t.Fatalf("SaveConnection target returned error: %v", err)
+	}
+
+	resolved, err := app.resolveDataSyncConfigSecrets(datasync.SyncConfig{
+		SourceConfig: connection.ConnectionConfig{
+			ID:       "source-pg",
+			Type:     "postgres",
+			Host:     "source.local",
+			Port:     5432,
+			User:     "postgres",
+			Database: "schedule",
+		},
+		TargetConfig: connection.ConnectionConfig{
+			ID:       "target-pg",
+			Type:     "postgres",
+			Host:     "target.local",
+			Port:     5432,
+			User:     "postgres",
+			Database: "warehouse",
+		},
+		Tables: []string{"jobs"},
+	})
+	if err != nil {
+		t.Fatalf("resolveDataSyncConfigSecrets returned error: %v", err)
+	}
+	if resolved.SourceConfig.Password != "source-secret" {
+		t.Fatalf("expected source password to be restored, got %q", resolved.SourceConfig.Password)
+	}
+	if resolved.TargetConfig.Password != "target-secret" {
+		t.Fatalf("expected target password to be restored, got %q", resolved.TargetConfig.Password)
+	}
+	if resolved.SourceConfig.Database != "schedule" || resolved.TargetConfig.Database != "warehouse" {
+		t.Fatalf("expected selected databases to be preserved, got source=%q target=%q", resolved.SourceConfig.Database, resolved.TargetConfig.Database)
+	}
+}