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/client.go

@@ -0,0 +1,59 @@
+//
+//  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"
+	"ragflow/internal/server"
+)
+
+// Engine Infinity engine implementation
+// Note: Infinity Go SDK is not yet available. This is a placeholder implementation.
+type infinityEngine struct {
+	config *server.InfinityConfig
+}
+
+// NewEngine creates an Infinity engine
+// Note: This is a placeholder implementation waiting for official Infinity Go SDK
+func NewEngine(cfg interface{}) (*infinityEngine, error) {
+	infConfig, ok := cfg.(*server.InfinityConfig)
+	if !ok {
+		return nil, fmt.Errorf("invalid infinity config type, expected *config.InfinityConfig")
+	}
+
+	engine := &infinityEngine{
+		config: infConfig,
+	}
+
+	return engine, nil
+}
+
+// Type returns the engine type
+func (e *infinityEngine) Type() string {
+	return "infinity"
+}
+
+// Ping health check
+func (e *infinityEngine) Ping(ctx context.Context) error {
+	return fmt.Errorf("infinity engine not implemented: waiting for official Go SDK")
+}
+
+// Close closes the connection
+func (e *infinityEngine) Close() error {
+	return nil
+}