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/config_reader.h

@@ -0,0 +1,46 @@
+/*
+* 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_CONFIG_H_
+#define __OPENCC_CONFIG_H_
+
+#include "utils.h"
+#include "dictionary_set.h"
+
+typedef void * config_t;
+
+typedef enum
+{
+    CONFIG_ERROR_VOID,
+    CONFIG_ERROR_CANNOT_ACCESS_CONFIG_FILE,
+    CONFIG_ERROR_PARSE,
+    CONFIG_ERROR_NO_PROPERTY,
+    CONFIG_ERROR_INVALID_DICT_TYPE,
+} config_error;
+
+config_t config_open(const char * filename, const char* home_path);
+
+void config_close(config_t t_config);
+
+dictionary_set_t config_get_dictionary_set(config_t t_config);
+
+config_error config_errno(void);
+
+void config_perror(const char * spec);
+
+#endif /* __OPENCC_CONFIG_H_ */