[feat] extra parameters are all passed directly via http payload now, or in extra_body if using openai client (#3058)

* [feat] extra parameters are all passed directly via http payload now, or in extra_body if using openai client

* [fix] delete ci test case for enable_thinking

* [fix] add reasoning_parser when server starts

* [fix] fix ci consistency test error with reasoning parser

* [doc] update docs related to metadata

* [fix] cancel enable_thinking default value

docs/get_started/ernie-4.5-vl.md

@@ -113,7 +113,7 @@ curl -X POST "http://0.0.0.0:8180/v1/chat/completions" \
       {"type": "text", "text": "From which era does the artifact in the image originate?"}
     ]}
   ],
-  "metadata": {"enable_thinking": false}
+  "enable_thinking": false
 }'
 ```