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>

admin/client/parser.py

@@ -92,6 +92,7 @@ sql_command: login_user
            | drop_chat_session
            | list_chat_sessions
            | chat_on_session
+           | list_server_configs
            | benchmark
 
 // meta command definition
@@ -176,6 +177,7 @@ BENCHMARK: "BENCHMARK"i
 PING: "PING"i
 SESSION: "SESSION"i
 SESSIONS: "SESSIONS"i
+SERVER: "SERVER"i
 
 login_user: LOGIN USER quoted_string ";"
 list_services: LIST SERVICES ";"
@@ -221,6 +223,8 @@ list_variables: LIST VARS ";"
 list_configs: LIST CONFIGS ";"
 list_environments: LIST ENVS ";"
 
+list_server_configs: LIST SERVER CONFIGS ";"
+
 benchmark: BENCHMARK NUMBER NUMBER user_statement
 
 user_statement: ping_server
@@ -473,6 +477,9 @@ class RAGFlowCLITransformer(Transformer):
     def list_environments(self, items):
         return {"type": "list_environments"}
 
+    def list_server_configs(self, items):
+        return {"type": "list_server_configs"}
+
     def create_model_provider(self, items):
         provider_name = items[3].children[0].strip("'\"")
         provider_key = items[4].children[0].strip("'\"")