RAGFlow go API server (#13240)

# RAGFlow Go Implementation Plan 🚀

This repository tracks the progress of porting RAGFlow to Go. We'll
implement core features and provide performance comparisons between
Python and Go versions.

## Implementation Checklist

- [x] User Management APIs
- [x] Dataset Management Operations
- [x] Retrieval Test
- [x] Chat Management Operations
- [x] Infinity Go SDK

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Co-authored-by: Yingfeng Zhang <yingfeng.zhang@gmail.com>

internal/engine/infinity/document.go

@@ -0,0 +1,47 @@
+//
+//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+package infinity
+
+import (
+	"context"
+	"fmt"
+)
+
+// IndexDocument indexes a single document
+func (e *infinityEngine) IndexDocument(ctx context.Context, tableName, docID string, doc interface{}) error {
+	return fmt.Errorf("infinity insert not implemented: waiting for official Go SDK")
+}
+
+// BulkIndex indexes documents in bulk
+func (e *infinityEngine) BulkIndex(ctx context.Context, tableName string, docs []interface{}) (interface{}, error) {
+	return nil, fmt.Errorf("infinity bulk insert not implemented: waiting for official Go SDK")
+}
+
+// BulkResponse bulk operation response
+type BulkResponse struct {
+	Inserted int
+}
+
+// GetDocument gets a document
+func (e *infinityEngine) GetDocument(ctx context.Context, tableName, docID string) (interface{}, error) {
+	return nil, fmt.Errorf("infinity get document not implemented: waiting for official Go SDK")
+}
+
+// DeleteDocument deletes a document
+func (e *infinityEngine) DeleteDocument(ctx context.Context, tableName, docID string) error {
+	return fmt.Errorf("infinity delete not implemented: waiting for official Go SDK")
+}