perf(backend): 使用 gjson/sjson 优化热路径 JSON 处理
将 API 网关热路径中的 json.Unmarshal+json.Marshal 替换为 gjson 零拷贝查询和 sjson 精准写入: - unwrapV1InternalResponse 性能提升 22x(4009ns→182ns),内存分配减少 28.5x - unwrapGeminiResponse、extractGeminiUsage、estimateGeminiCountTokens、ParseGeminiRateLimitResetTime 改为接收 []byte 使用 gjson 提取 - ParseGatewayRequest 的 model/stream/metadata/thinking/max_tokens 改用 gjson 类型安全提取 - Handler 层(sora/openai)改用 gjson 提取字段、sjson 注入/修改字段,移除 map[string]any 中间变量 - Sora Client 响应解析改用 gjson ForEach 遍历,减少内存分配 - 新增约 100 个单元测试用例,所有改动函数覆盖率 >85% Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@@ -230,7 +230,7 @@ func NewOpenAIGatewayService(
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// 1. Header: session_id
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// 2. Header: conversation_id
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// 3. Body: prompt_cache_key (opencode)
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func (s *OpenAIGatewayService) GenerateSessionHash(c *gin.Context, reqBody map[string]any) string {
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func (s *OpenAIGatewayService) GenerateSessionHash(c *gin.Context, body []byte) string {
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if c == nil {
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return ""
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}
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@@ -239,10 +239,8 @@ func (s *OpenAIGatewayService) GenerateSessionHash(c *gin.Context, reqBody map[s
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if sessionID == "" {
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sessionID = strings.TrimSpace(c.GetHeader("conversation_id"))
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}
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if sessionID == "" && reqBody != nil {
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if v, ok := reqBody["prompt_cache_key"].(string); ok {
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sessionID = strings.TrimSpace(v)
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}
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if sessionID == "" && len(body) > 0 {
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sessionID = strings.TrimSpace(gjson.GetBytes(body, "prompt_cache_key").String())
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}
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if sessionID == "" {
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return ""
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