feat: gemini add think option (cloudwego#451)

feat: gemini add think option (cloudwego#451)

feat(a2a): support message/send non-blocking (cloudwego#447)

feat(ark): support extract service tier in response (cloudwego#440)

fix: typo (cloudwego#439)

feat(ark): support service iter (cloudwego#438)

fix(ark): ResponsesAPI stream finish_reason (cloudwego#434)

fix: ut

fix(model): miss CachedTokens in CallbackOutput (cloudwego#428)

fix(model): miss CachedTokens in CallbackOutput (cloudwego#428)