feat(kiro): enhance request format, stream handling, and usage tracking

## English Description

### Request Format Fixes
- Fix conversationState field order (chatTriggerType must be first)
- Add conditional profileArn inclusion based on auth method
- builder-id auth (AWS SSO) doesn't require profileArn
- social auth (Google OAuth) requires profileArn

### Stream Processing Enhancements
- Add headersLen boundary validation to prevent slice out of bounds
- Handle incomplete tool use at EOF by flushing pending data
- Separate message_delta and message_stop events for proper streaming
- Add error logging for JSON unmarshal failures

### JSON Repair Improvements
- Add escapeNewlinesInStrings() to handle control characters in JSON strings
- Remove incorrect unquotedKeyPattern that broke valid JSON content
- Fix handling of streaming fragments with embedded newlines/tabs

### Debug Info Filtering (Optional)
- Add filterHeliosDebugInfo() to remove [HELIOS_CHK] blocks
- Pattern matches internal state tracking from Kiro/Amazon Q
- Currently disabled pending further testing

### Usage Tracking
- Add usage information extraction in message_delta response
- Include prompt_tokens, completion_tokens, total_tokens in OpenAI format

---

## 中文描述

### 请求格式修复
- 修复 conversationState 字段顺序（chatTriggerType 必须在第一位）
- 根据认证方式条件性包含 profileArn
- builder-id 认证（AWS SSO）不需要 profileArn
- social 认证（Google OAuth）需要 profileArn

### 流处理增强
- 添加 headersLen 边界验证，防止切片越界
- 在 EOF 时处理未完成的工具调用，刷新待处理数据
- 分离 message_delta 和 message_stop 事件以实现正确的流式传输
- 添加 JSON 反序列化失败的错误日志

### JSON 修复改进
- 添加 escapeNewlinesInStrings() 处理 JSON 字符串中的控制字符
- 移除错误的 unquotedKeyPattern，该模式会破坏有效的 JSON 内容
- 修复包含嵌入换行符/制表符的流式片段处理

### 调试信息过滤（可选）
- 添加 filterHeliosDebugInfo() 移除 [HELIOS_CHK] 块
- 模式匹配来自 Kiro/Amazon Q 的内部状态跟踪信息
- 目前已禁用，等待进一步测试

### 使用量跟踪
- 在 message_delta 响应中添加 usage 信息提取
- 以 OpenAI 格式包含 prompt_tokens、completion_tokens、total_tokens

internal/translator/kiro/openai/chat-completions/kiro_openai_response.go

@@ -171,7 +171,7 @@ func convertClaudeEventToOpenAI(jsonStr string, model string) []string {
 		return results
 
 	case "message_delta":
-		// Final message delta with stop_reason
+		// Final message delta with stop_reason and usage
 		stopReason := root.Get("delta.stop_reason").String()
 		if stopReason != "" {
 			finishReason := "stop"
@@ -196,6 +196,19 @@ func convertClaudeEventToOpenAI(jsonStr string, model string) []string {
 					},
 				},
 			}
+
+			// Extract and include usage information from message_delta event
+			usage := root.Get("usage")
+			if usage.Exists() {
+				inputTokens := usage.Get("input_tokens").Int()
+				outputTokens := usage.Get("output_tokens").Int()
+				response["usage"] = map[string]interface{}{
+					"prompt_tokens":     inputTokens,
+					"completion_tokens": outputTokens,
+					"total_tokens":      inputTokens + outputTokens,
+				}
+			}
+
 			result, _ := json.Marshal(response)
 			results = append(results, string(result))
 		}