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/cpp/opencc/encoding.h

@@ -0,0 +1,36 @@
+/*
+* Open Chinese Convert
+*
+* Copyright 2010 BYVoid <byvoid.kcp@gmail.com>
+*
+* 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.
+*/
+
+#ifndef __OPENCC_ENCODING_H_
+#define __OPENCC_ENCODING_H_
+
+#include "utils.h"
+
+ucs4_t * utf8_to_ucs4(const char * utf8, size_t length);
+
+char * ucs4_to_utf8(const ucs4_t * ucs4, size_t length);
+
+size_t ucs4len(const ucs4_t * str);
+
+int ucs4cmp(const ucs4_t * str1, const ucs4_t * str2);
+
+void ucs4cpy(ucs4_t * dest, const ucs4_t * src);
+
+void ucs4ncpy(ucs4_t * dest, const ucs4_t * src, size_t len);
+
+#endif /* __OPENCC_ENCODING_H_ */