✨ feat(data-import): 重构大文件导入与安全任务运行时

- SQL、CSV、JSON 与 XLSX 改为资源受限的流式解析，并支持压缩、编码和方言预检

- 增加遇错停止/继续策略、持久任务、错误行导出、源文件身份与安全取消

- 为数据库驱动补齐上下文事务和写入结果未知语义，避免失败重放与脏会话复用

internal/db/postgres_applychanges_context_test.go

@@ -0,0 +1,94 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"errors"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"GoNavi-Wails/internal/connection"
+)
+
+const postgresApplyChangesContextDriverName = "postgres_apply_changes_context"
+
+var (
+	registerPostgresApplyChangesContextDriverOnce sync.Once
+	postgresApplyChangesContextExecStarted        = make(chan struct{}, 1)
+)
+
+type postgresApplyChangesContextDriver struct{}
+
+type postgresApplyChangesContextConn struct{}
+
+type postgresApplyChangesContextTx struct{}
+
+func (postgresApplyChangesContextDriver) Open(string) (driver.Conn, error) {
+	return postgresApplyChangesContextConn{}, nil
+}
+
+func (postgresApplyChangesContextConn) Prepare(string) (driver.Stmt, error) {
+	return nil, driver.ErrSkip
+}
+
+func (postgresApplyChangesContextConn) Close() error { return nil }
+
+func (postgresApplyChangesContextConn) Begin() (driver.Tx, error) {
+	return nil, errors.New("legacy Begin must not be used")
+}
+
+func (postgresApplyChangesContextConn) BeginTx(context.Context, driver.TxOptions) (driver.Tx, error) {
+	return postgresApplyChangesContextTx{}, nil
+}
+
+func (postgresApplyChangesContextConn) ExecContext(ctx context.Context, _ string, _ []driver.NamedValue) (driver.Result, error) {
+	select {
+	case postgresApplyChangesContextExecStarted <- struct{}{}:
+	default:
+	}
+	<-ctx.Done()
+	return nil, ctx.Err()
+}
+
+func (postgresApplyChangesContextTx) Commit() error   { return nil }
+func (postgresApplyChangesContextTx) Rollback() error { return nil }
+
+func TestPostgresApplyChangesContextCancelsInFlightStatement(t *testing.T) {
+	registerPostgresApplyChangesContextDriverOnce.Do(func() {
+		sql.Register(postgresApplyChangesContextDriverName, postgresApplyChangesContextDriver{})
+	})
+
+	conn, err := sql.Open(postgresApplyChangesContextDriverName, "")
+	if err != nil {
+		t.Fatalf("open context-aware test database: %v", err)
+	}
+	t.Cleanup(func() { _ = conn.Close() })
+
+	ctx, cancel := context.WithCancel(context.Background())
+	errCh := make(chan error, 1)
+	go func() {
+		errCh <- (&PostgresDB{conn: conn}).ApplyChangesContext(ctx, "public.orders", connection.ChangeSet{
+			Deletes: []map[string]interface{}{{"id": 42}},
+		})
+	}()
+
+	select {
+	case <-postgresApplyChangesContextExecStarted:
+		cancel()
+	case <-time.After(time.Second):
+		cancel()
+		t.Fatal("ApplyChangesContext did not reach the context-aware SQL execution path")
+	}
+
+	select {
+	case err := <-errCh:
+		if err == nil || !strings.Contains(err.Error(), context.Canceled.Error()) {
+			t.Fatalf("ApplyChangesContext error = %v, want context cancellation", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("ApplyChangesContext did not return after cancellation")
+	}
+}