Fix the error where Claude's chain of thought validation failed.

Previously, the text field was used, which caused validation failures and errors, even though clients could see the content. This was because the content was placed in a box named text instead of thinking. This issue has now been fixed, and Claude-related models can correctly return the chain of thought.

Author: CyrilPeng

internal/server/handlers.go

@@ -401,6 +401,7 @@ func streamOpenAIToClaude(w *bufio.Writer, reader io.Reader, providerModel strin
 					"index": thinkingBlockIndex,
 					"content_block": map[string]interface{}{
 						"type": "thinking",
+						"thinking": "",
 					},
 				})
 				thinkingBlockStarted = true
@@ -413,7 +414,7 @@ func streamOpenAIToClaude(w *bufio.Writer, reader io.Reader, providerModel strin
 				"index": thinkingBlockIndex,
 				"delta": map[string]interface{}{
 					"type": "thinking_delta",
-					"text": reasoningContent,
+					"thinking": reasoningContent,
 				},
 			})
 		}